busybox

The Swiss Army Knife of Embedded Linux

SYNTAX

busybox <applet> [arguments...] # or <applet> [arguments...] # if symlinked

DESCRIPTION

BusyBox combines tiny versions of many common UNIX utilities into a single small executable. It provides minimalist replacements for most of the utilities you usually find in GNU coreutils, util-linux, etc. The utilities in BusyBox generally have fewer options than their full-featured GNU cousins; however, the options that are included provide the expected functionality and behave very much like their GNU counterparts.

BusyBox has been written with size-optimization and limited resources in mind. It is also extremely modular so you can easily include or exclude commands (or features) at compile time. This makes it easy to customize your embedded systems. To create a working system, just add /dev, /etc, and a Linux kernel. BusyBox provides a fairly complete POSIX environment for any small or embedded system.

BusyBox is extremely configurable. This allows you to include only the components you need, thereby reducing binary size. Run 'make config' or 'make menuconfig' to select the functionality that you wish to enable. Then run 'make' to compile BusyBox using your configuration.

After the compile has finished, you should use 'make install' to install BusyBox. This will install the 'bin/busybox' binary, in the target directory specified by CONFIG_PREFIX. CONFIG_PREFIX can be set when configuring BusyBox, or you can specify an alternative location at install time (i.e., with a command line like 'make CONFIG_PREFIX=/tmp/foo install'). If you enabled any applet installation scheme (either as symlinks or hardlinks), these will also be installed in the location pointed to by CONFIG_PREFIX.

USAGE

BusyBox is a multi-call binary. A multi-call binary is an executable program that performs the same job as more than one utility program. That means there is just a single BusyBox binary, but that single binary acts like a large number of utilities. This allows BusyBox to be smaller since all the built-in utility programs (we call them applets) can share code for many common operations.

You can also invoke BusyBox by issuing a command as an argument on the command line. For example, entering

/bin/busybox ls

will also cause BusyBox to behave as 'ls'.

Of course, adding '/bin/busybox' into every command would be painful. So most people will invoke BusyBox using links to the BusyBox binary.

For example, entering

ln -s /bin/busybox ls ./ls

will cause BusyBox to behave as 'ls' (if the 'ls' command has been compiled into BusyBox). Generally speaking, you should never need to make all these links yourself, as the BusyBox build system will do this for you when you run the 'make install' command.

If you invoke BusyBox with no arguments, it will provide you with a list of the applets that have been compiled into your BusyBox binary.

COMMON OPTIONS

Most BusyBox applets support the --help argument to provide a terse runtime description of their behavior. If the CONFIG_FEATURE_VERBOSE_USAGE option has been enabled, more detailed usage information will also be available.

COMMANDS

Currently available applets include:

[, [[, acpid, addgroup, adduser, adjtimex, ar, arch, arp, arping, ascii, ash, awk, base32, base64, basename, bbconfig, bc, beep, blkdiscard, blkid, blockdev, bootchartd, brctl, bunzip2, busybox, bzcat, bzip2, cal, cat, chat, chattr, chgrp, chmod, chown, chpasswd, chpst, chroot, chrt, chvt, cksum, clear, cmp, comm, cp, cpio, crc32, crond, crontab, cryptpw, cttyhack, cut, date, dc, dd, deallocvt, delgroup, deluser, depmod, df, dhcprelay, diff, dirname, dmesg, dnsd, dnsdomainname, dos2unix, du, dumpkmap, dumpleases, echo, ed, egrep, eject, env, envdir, envuidgid, ether-wake, expand, expr, factor, fakeidentd, fallocate, false, fatattr, fbset, fbsplash, fdflush, fdformat, fdisk, fgconsole, fgrep, find, findfs, flock, fold, free, freeramdisk, fsck, fsck.minix, fsfreeze, fstrim, fsync, ftpd, ftpget, ftpput, fuser, getopt, getty, grep, groups, gunzip, gzip, halt, hd, hdparm, head, hexdump, hexedit, hostid, hostname, httpd, hwclock, i2cdetect, i2cdump, i2cget, i2cset, i2ctransfer, id, ifconfig, ifdown, ifenslave, ifplugd, ifup, inetd, init, inotifyd, insmod, install, ionice, iostat, ip, ipaddr, ipcalc, ipcrm, ipcs, iplink, ipneigh, iproute, iprule, iptunnel, kbd_mode, kill, killall, killall5, klogd, less, link, linux32, linux64, linuxrc, ln, loadfont, loadkmap, logger, login, logname, logread, losetup, lpd, lpq, lpr, ls, lsattr, lsmod, lsof, lspci, lsscsi, lsusb, lzcat, lzma, lzopcat, makedevs, makemime, man, md5sum, mdev, mesg, microcom, mkdir, mkdosfs, mke2fs, mkfifo, mkfs.ext2, mkfs.minix, mkfs.vfat, mknod, mkpasswd, mkswap, mktemp, modinfo, modprobe, more, mount, mountpoint, mpstat, mt, mv, nameif, nbd-client, nc, netstat, nice, nl, nmeter, nohup, nproc, nsenter, nslookup, ntpd, od, openvt, partprobe, passwd, paste, patch, pgrep, pidof, ping, ping6, pipe_progress, pivot_root, pkill, pmap, popmaildir, poweroff, powertop, printenv, printf, ps, pscan, pstree, pwd, pwdx, raidautorun, rdate, rdev, readahead, readlink, readprofile, realpath, reboot, reformime, renice, reset, resize, resume, rev, rfkill, rm, rmdir, rmmod, route, rpm2cpio, rtcwake, run-init, run-parts, runsv, runsvdir, rx, script, scriptreplay, sed, sendmail, seq, setarch, setconsole, setfattr, setfont, setkeycodes, setlogcons, setpriv, setserial, setsid, setuidgid, sh, sha1sum, sha256sum, sha3sum, sha512sum, showkey, shred, shuf, slattach, sleep, smemcap, softlimit, sort, split, ssl_client, start-stop-daemon, stat, strings, stty, su, sulogin, sum, sv, svc, svlogd, svok, swapoff, swapon, switch_root, sync, sysctl, syslogd, tac, tail, tar, taskset, tc, tcpsvd, tee, telnet, telnetd, test, tftp, tftpd, time, timeout, top, touch, tr, traceroute, traceroute6, true, truncate, ts, tty, ttysize, tunctl, tune2fs, ubiattach, ubidetach, ubimkvol, ubirename, ubirmvol, ubirsvol, ubiupdatevol, udhcpc, udhcpc6, udhcpd, udpsvd, uevent, umount, uname, uncompress, unexpand, uniq, unix2dos, unlink, unlzma, unlzop, unshare, unxz, unzip, uptime, usleep, uudecode, uuencode, vconfig, vi, vlock, volname, watch, watchdog, wc, wget, which, whoami, whois, xargs, xxd, xz, xzcat, yes, zcat, zcip

COMMAND DESCRIPTIONS

acpid

acpid [-df] [-c CONFDIR] [-l LOGFILE] [-a ACTIONFILE] [-M MAPFILE] [-e PROC_EVENT_FILE] [-p PIDFILE] Listen to ACPI events and spawn specific helpers on event arrival -d Log to stderr, not log file (implies -f) -f Run in foreground -c DIR Config directory [/etc/acpi] -e FILE /proc event file [/proc/acpi/event] -l FILE Log file [/var/log/acpid.log] -p FILE Pid file [/run/acpid.pid] -a FILE Action file [/etc/acpid.conf] -M FILE Map file [/etc/acpi.map] Accept and ignore compatibility options -g -m -s -S -v

addgroup

addgroup [-g GID] [-S] [USER] GROUP Add a group or add a user to a group -g GID Group id -S Create a system group

adduser

adduser [OPTIONS] USER [GROUP] Create new user, or add USER to GROUP -h DIR Home directory -g GECOS GECOS field -s SHELL Login shell -G GRP Group -S Create a system user -D Dont assign a password -H Dont create home directory -u UID User id -k SKEL Skeleton directory (/etc/skel)

adjtimex

adjtimex [-q] [-o OFS] [-f FREQ] [-p TCONST] [-t TICK] Read or set kernel time variables. See adjtimex (2) -q Quiet -o OFF Time offset, microseconds -f FREQ Frequency adjust, integer kernel units (65536 is 1ppm) -t TICK Microseconds per tick, usually 10000 (positive -t or -f values make clock run faster) -p TCONST

ar

ar x|p|t|r [-ov] ARCHIVE [FILE]... Extract or list FILEs from an ar archive, or create it x Extract p Extract to stdout t List r Create -o Restore mtime -v Verbose

arch

arch Print system architecture

arp

arp [-vn] [-H HWTYPE] [-i IF] -a [HOSTNAME] [-v] [-i IF] -d HOSTNAME [pub] [-v] [-H HWTYPE] [-i IF] -s HOSTNAME HWADDR [temp] [-v] [-H HWTYPE] [-i IF] -s HOSTNAME HWADDR [netmask MASK] pub [-v] [-H HWTYPE] [-i IF] -Ds HOSTNAME IFACE [netmask MASK] pub Manipulate ARP cache -a Display (all) hosts -d Delete ARP entry -s Set new entry -v Verbose -n Dont resolve names -i IF Network interface -D Read HWADDR from IFACE -A,-p AF Protocol family -H HWTYPE Hardware address type

arping

arping [-fqbDUA] [-c CNT] [-w TIMEOUT] [-I IFACE] [-s SRC_IP] DST_IP Send ARP requests/replies -f Quit on first ARP reply -q Quiet -b Keep broadcasting, dont go unicast -D Exit with 1 if DST_IP replies -U Unsolicited ARP mode, update your neighbors -A ARP answer mode, update your neighbors -c N Stop after sending N ARP requests -w TIMEOUT Seconds to wait for ARP reply -I IFACE Interface to use (default eth0) -s SRC_IP Sender IP address DST_IP Target IP address

ash

ash [-il] [-|+Cabefmnuvx] [-|+o OPT]... [-c 'SCRIPT' [ARG0 ARGS] | FILE [ARGS] | -s [ARGS]] Unix shell interpreter

awk

awk [OPTIONS] [AWK_PROGRAM] [FILE]... -v VAR=VAL Set variable -F SEP Use SEP as field separator -f FILE Read program from FILE -e AWK_PROGRAM

base32

base32 [-d] [-w COL] [FILE] Base32 encode or decode FILE to standard output -d Decode data -w COL Wrap lines at COL (default 76, 0 disables)

base64

base64 [-d] [-w COL] [FILE] Base64 encode or decode FILE to standard output -d Decode data -w COL Wrap lines at COL (default 76, 0 disables)

basename

basename FILE [SUFFIX] Strip directory path and .SUFFIX from FILE

bbconfig

bbconfig Print the config file used by busybox build

bc

bc [-sqlw] [FILE]... Arbitrary precision calculator -q Quiet -l Load standard library -s Be POSIX compatible -w Warn if extensions are used $BC_LINE_LENGTH changes output width

beep

beep -f FREQ -l LEN -d DELAY -r COUNT -n -f Frequency in Hz -l Length in ms -d Delay in ms -r Repetitions -n Start new tone

blkdiscard

blkdiscard [-o OFS] [-l LEN] [-s] DEVICE Discard sectors on DEVICE -o OFS Byte offset into device -l LEN Number of bytes to discard -s Perform a secure discard

blkid

blkid [BLOCKDEV]... Print UUIDs of all filesystems

blockdev

blockdev OPTION BLOCKDEV --setro Set ro --setrw Set rw --getro Get ro --getss Get sector size --getbsz Get block size --setbsz BYTES Set block size --getsz Get device size in 512-byte sectors --getsize64 Get device size in bytes --getra Get readahead in 512-byte sectors --setra SECTORS Set readahead --flushbufs Flush buffers --rereadpt Reread partition table

bootchartd

bootchartd start [PROG ARGS]|stop|init Create /var/log/bootchart.tgz with boot chart data start: start background logging; with PROG, run PROG, then kill logging with USR1 stop: send USR1 to all bootchartd processes init: start background logging; stop when getty/xdm is seen (for init scripts) Under PID 1: as init, then exec $bootchart_init, /init, /sbin/init

brctl

brctl COMMAND [BRIDGE [ARGS]] Manage ethernet bridges Commands: show [BRIDGE]... Show bridges addbr BRIDGE Create BRIDGE delbr BRIDGE Delete BRIDGE addif BRIDGE IFACE Add IFACE to BRIDGE delif BRIDGE IFACE Delete IFACE from BRIDGE showmacs BRIDGE List MAC addresses showstp BRIDGE Show STP info stp BRIDGE 1/yes/on|0/no/off Set STP on/off setageing BRIDGE SECONDS Set ageing time setfd BRIDGE SECONDS Set bridge forward delay sethello BRIDGE SECONDS Set hello time setmaxage BRIDGE SECONDS Set max message age setbridgeprio BRIDGE PRIO Set bridge priority setportprio BRIDGE IFACE PRIO Set port priority setpathcost BRIDGE IFACE COST Set path cost

bunzip2

bunzip2 [-cfk] [FILE]... Decompress FILEs (or stdin) -c Write to stdout -f Force -k Keep input files -t Test integrity

bzcat

bzcat [FILE]... Decompress to stdout

bzip2

bzip2 [-cfkdt123456789] [FILE]... Compress FILEs (or stdin) with bzip2 algorithm -1..9 Compression level -d Decompress -c Write to stdout -f Force -k Keep input files -t Test integrity

cal

cal [-jy] [[MONTH] YEAR] Display a calendar -j Use julian dates -y Display the entire year

cat

cat [-nbvteA] [FILE]... Print FILEs to stdout -n Number output lines -b Number nonempty lines -v Show nonprinting characters as ^x or M-x -t ...and tabs as ^I -e ...and end lines with $ -A Same as -vte

chat

chat EXPECT [SEND [EXPECT [SEND]]...] Useful for interacting with a modem connected to stdin/stdout. A script consists of expect-send argument pairs. Example: chat '' ATZ OK ATD123456 CONNECT '' ogin: pppuser word: ppppass '~'

chattr

chattr [-R] [-v VERSION] [-p PROJID] [-+=AacDdijsStTu] FILE... Change ext2 file attributes -R Recurse -v NUM Set version/generation number -p NUM Set project number Modifiers: -,+,= Remove/add/set attributes Attributes: A No atime a Append only C No copy-on-write c Compressed D Synchronous dir updates d Dont backup with dump E Encrypted e File uses extents F Case-insensitive dir I Indexed dir i Immutable j Write data to journal first N File is stored in inode P Hierarchical project ID dir S Synchronous file updates s Zero storage when deleted T Top of dir hierarchy t Dont tail-merge with other files u Allow undelete V Verity

chgrp

chgrp [-RhLHPcvf]... GROUP FILE... Change the group membership of FILEs to GROUP -h Affect symlinks instead of symlink targets -L Traverse all symlinks to directories -H Traverse symlinks on command line only -P Dont traverse symlinks (default) -R Recurse -c List changed files -v Verbose -f Hide errors

chmod

chmod [-Rcvf] MODE[,MODE]... FILE... MODE is octal number (bit pattern sstrwxrwxrwx) or [ugoa]{+|-|=}[rwxXst] -R Recurse -c List changed files -v Verbose -f Hide errors

chown

chown [-RhLHPcvf]... USER[:[GRP]] FILE... Change the owner and/or group of FILEs to USER and/or GRP -h Affect symlinks instead of symlink targets -L Traverse all symlinks to directories -H Traverse symlinks on command line only -P Dont traverse symlinks (default) -R Recurse -c List changed files -v Verbose -f Hide errors

chpasswd

chpasswd [-me] [-c ALG] [-R DIR] Read user:password from stdin and update /etc/passwd -e Supplied passwords are in encrypted form -m Encrypt using md5, not des -c ALG des,md5,sha256/512 (default des) -R DIR Directory to chroot into

chpst

chpst [-vP012] [-u USER[:GRP]] [-U USER[:GRP]] [-e DIR] [-/ DIR] [-n NICE] [-m BYTES] [-d BYTES] [-o N] [-p N] [-f BYTES] [-c BYTES] PROG ARGS Change the process state, run PROG -u USER[:GRP] Set uid and gid -U USER[:GRP] Set $UID and $GID in environment -e DIR Set environment variables as specified by files in DIR: file=1st_line_of_file -/ DIR Chroot to DIR -n NICE Add NICE to nice value -m BYTES Same as -d BYTES -s BYTES -l BYTES -d BYTES Limit data segment -o N Limit number of open files per process -p N Limit number of processes per uid -f BYTES Limit output file sizes -c BYTES Limit core file size -v Verbose -P Create new process group -0 Close stdin -1 Close stdout -2 Close stderr

chroot

chroot NEWROOT [PROG ARGS] Run PROG with root directory set to NEWROOT

chrt

chrt -m | -p [PRIO] PID | [-rfobi] PRIO PROG ARGS Change scheduling priority and class for a process -m Show min/max priorities -p Operate on PID -r Set SCHED_RR class -f Set SCHED_FIFO class -o Set SCHED_OTHER class -b Set SCHED_BATCH class -i Set SCHED_IDLE class

chvt

chvt N Change the foreground virtual terminal to /dev/ttyN

cksum

cksum FILE... Calculate CRC32 checksum of FILEs

clear

clear Clear screen

cmp

cmp [-ls] FILE1 [FILE2 [SKIP1 [SKIP2]]] Compare FILE1 with FILE2 (or stdin) -l Write the byte numbers (decimal) and values (octal) for all differing bytes -s Quiet

comm

comm [-123] FILE1 FILE2 Compare FILE1 with FILE2 -1 Suppress lines unique to FILE1 -2 Suppress lines unique to FILE2 -3 Suppress lines common to both files

cp

cp [-arPLHpfinlsTu] SOURCE DEST or: cp [-arPLHpfinlsu] SOURCE... { -t DIRECTORY | DIRECTORY } Copy SOURCEs to DEST -a Same as -dpR -R,-r Recurse -d,-P Preserve symlinks (default if -R) -L Follow all symlinks -H Follow symlinks on command line -p Preserve file attributes if possible -f Overwrite -i Prompt before overwrite -n Dont overwrite -l,-s Create (sym)links -T Refuse to copy if DEST is a directory -t DIR Copy all SOURCEs into DIR -u Copy only newer files

cpio

cpio [-dmvu] [-F FILE] [-R USER[:GRP]] [-H newc] [-tio] [EXTR_FILE]... Extract (-i) or list (-t) files from a cpio archive, or take file list from stdin and create an archive (-o) Main operation mode: -t List -i Extract EXTR_FILEs (or all) -o Create (requires -H newc) Options: -H newc Archive format -d Make leading directories -m Restore mtime -v Verbose -u Overwrite -F FILE Input (-t,-i,-p) or output (-o) file -R USER[:GRP] Set owner of created files -L Dereference symlinks -0 Input is separated by NULs

crc32

crc32 FILE... Calculate CRC32 checksum of FILEs

crond

crond [-fbS] [-l N] [-d N] [-L LOGFILE] [-c DIR] -f Foreground -b Background (default) -S Log to syslog (default) -l N Set log level. Most verbose 0, default 8 -d N Set log level, log to stderr -L FILE Log to FILE -c DIR Cron dir. Default:/var/spool/cron/crontabs

crontab

crontab [-c DIR] [-u USER] [-ler]|[FILE] -c Crontab directory -u User -l List crontab -e Edit crontab -r Delete crontab FILE Replace crontab by FILE (-: stdin)

cryptpw

cryptpw [-P FD] [-m TYPE] [-S SALT] [PASSWORD] [SALT] Print crypt (3) hashed PASSWORD -P N Read password from fd N -m TYPE des,md5,sha256/512 (default des) -S SALT

cttyhack

cttyhack [PROG ARGS] Give PROG a controlling tty if possible. Example for /etc/inittab (for busybox init): ::respawn:/bin/cttyhack /bin/sh Giving controlling tty to shell running with PID 1: $ exec cttyhack sh Starting interactive shell from boot shell script: setsid cttyhack sh

cut

cut [OPTIONS] [FILE]... Print selected fields from FILEs to stdout -b LIST Output only bytes from LIST -c LIST Output only characters from LIST -d SEP Field delimiter for input (default -f TAB, -F run of whitespace) -O SEP Field delimeter for output (default = -d for -f, one space for -F) -D Dont sort/collate sections or match -fF lines without delimeter -f LIST Print only these fields (-d is single char) -F LIST Print only these fields (-d is regex) -s Output only lines containing delimiter -n Ignored

date

date [OPTIONS] [+FMT] [[-s] TIME] Display time (using +FMT), or set time -u Work in UTC (dont convert to local time) [-s] TIME Set time to TIME -d TIME Display TIME, not now -D FMT FMT (strptime format) for -s/-d TIME conversion -r FILE Display last modification time of FILE -R Output RFC-2822 date -I[SPEC] Output ISO-8601 date SPEC=date (default), hours, minutes, seconds or ns Recognized TIME formats: @seconds_since_1970 hh:mm[:ss] [YYYY.]MM.DD-hh:mm[:ss] YYYY-MM-DD hh:mm[:ss] [[[[[YY]YY]MM]DD]hh]mm[.ss] date TIME form accepts MMDDhhmm[[YY]YY][.ss] instead

  1. dc [-x] [-eSCRIPT]... [-fFILE]... [FILE]... Tiny RPN calculator. Operations: Arithmetic: + - * / % ^ ~ - divide with remainder | - modular exponentiation v - square root p - print top of the stack without popping f - print entire stack k - pop the value and set precision i - pop the value and set input radix o - pop the value and set output radix Examples: dc -e'2 2 + p' -> 4, dc -e'8 8 * 2 2 + / p' -> 16

dd

dd [if=FILE] [of=FILE] [ibs=N obs=N/bs=N] [count=N] [skip=N] [seek=N] [conv=notrunc|noerror|sync|fsync] [iflag=skip_bytes|count_bytes|fullblock|direct] [oflag=seek_bytes|append|direct] Copy a file with converting and formatting if=FILE Read from FILE instead of stdin of=FILE Write to FILE instead of stdout bs=N Read and write N bytes at a time ibs=N Read N bytes at a time obs=N Write N bytes at a time count=N Copy only N input blocks skip=N Skip N input blocks seek=N Skip N output blocks conv=notrunc Dont truncate output file conv=noerror Continue after read errors conv=sync Pad blocks with zeros conv=fsync Physically write data out before finishing conv=swab Swap every pair of bytes iflag=skip_bytes skip=N is in bytes iflag=count_bytes count=N is in bytes oflag=seek_bytes seek=N is in bytes iflag=direct O_DIRECT input oflag=direct O_DIRECT output iflag=fullblock Read full blocks oflag=append Open output in append mode status=noxfer Suppress rate output status=none Suppress all output N may be suffixed by c (1), w (2), b (512), kB (1000), k (1024), MB, M, GB, G

deallocvt

deallocvt [N] Deallocate unused virtual terminal /dev/ttyN

delgroup

delgroup [USER] GROUP Delete group GROUP from the system or user USER from group GROUP

deluser

deluser [--remove-home] USER Delete USER from the system

depmod

depmod [-n] Generate modules.dep.bb -n Dry run: print file to stdout

df

df [-PkmhTai] [-B SIZE] [-t TYPE] [FILESYSTEM]... Print filesystem usage statistics -P POSIX output format -k 1024-byte blocks (default) -m 1M-byte blocks -h Human readable (e.g. 1K 243M 2G) -T Print filesystem type -t TYPE Print only mounts of this type -a Show all filesystems -i Inodes -B SIZE Blocksize

dhcprelay

dhcprelay CLIENT_IFACE[,CLIENT_IFACE2]... SERVER_IFACE [SERVER_IP] Relay DHCP requests between clients and server

diff

diff [-abBdiNqrTstw] [-L LABEL] [-S FILE] [-U LINES] FILE1 FILE2 Compare files line by line and output the differences between them. This implementation supports unified diffs only. -a Treat all files as text -b Ignore changes in the amount of whitespace -B Ignore changes whose lines are all blank -d Try hard to find a smaller set of changes -i Ignore case differences -L Use LABEL instead of the filename in the unified header -N Treat absent files as empty -q Output only whether files differ -r Recurse -S Start with FILE when comparing directories -T Make tabs line up by prefixing a tab when necessary -s Report when two files are the same -t Expand tabs to spaces in output -U Output LINES lines of context -w Ignore all whitespace

dirname

dirname FILENAME Strip non-directory suffix from FILENAME

dmesg

dmesg [-cr] [-n LEVEL] [-s SIZE] Print or control the kernel ring buffer -c Clear ring buffer after printing -n LEVEL Set console logging level -s SIZE Buffer size -r Print raw message buffer

dnsd

dnsd [-dvs] [-c CONFFILE] [-t TTL_SEC] [-p PORT] [-i ADDR] Small static DNS server daemon -c FILE Config file -t SEC TTL -p PORT Listen on PORT -i ADDR Listen on ADDR -d Daemonize -v Verbose -s Send successful replies only. Use this if you want to use /etc/resolv.conf with two nameserver lines: nameserver DNSD_SERVER nameserver NORMAL_DNS_SERVER

dos2unix

dos2unix [-ud] [FILE] Convert FILE in-place from DOS to Unix format. When no file is given, use stdin/stdout. -u dos2unix -d unix2dos

du

du [-aHLdclsxhmk] [FILE]... Summarize disk space used for FILEs (or directories) -a Show file sizes too -b Apparent size (including holes) -L Follow all symlinks -H Follow symlinks on command line -d N Limit output to directories (and files with -a) of depth < N -c Show grand total -l Count sizes many times if hard linked -s Display only a total for each argument -x Skip directories on different filesystems -h Sizes in human readable format (e.g., 1K 243M 2G) -m Sizes in megabytes -k Sizes in kilobytes (default)

dumpkmap

dumpkmap > keymap Print a binary keyboard translation table to stdout

dumpleases

dumpleases [-r|-a] [-d] [-f LEASEFILE] Display DHCP leases granted by udhcpd -f FILE Lease file -r Show remaining time -a Show expiration time -d Show time in seconds

echo

echo [-neE] [ARG]... Print ARGs to stdout -n No trailing newline -e Interpret backslash escapes (\t=tab etc) -E Dont interpret backslash escapes (default)

ed

ed [FILE]

eject

eject [-t] [-T] [DEVICE] Eject DEVICE or default /dev/cdrom -s SCSI device -t Close tray -T Open/close tray (toggle)

env

env [-i0] [-u NAME]... [-] [NAME=VALUE]... [PROG ARGS] Print current environment or run PROG after setting up environment -, -i Start with empty environment -0 NUL terminated output -u NAME Remove variable from environment

envdir

envdir DIR PROG ARGS Set various environment variables as specified by files in the directory DIR, run PROG

envuidgid

envuidgid USER PROG ARGS Set $UID to USER's uid and $GID to USER's gid, run PROG

ether-wake

ether-wake [-b] [-i IFACE] [-p aa:bb:cc:dd[:ee:ff]/a.b.c.d] MAC Send a magic packet to wake up sleeping machines. MAC must be a station address (00:11:22:33:44:55) or a hostname with a known 'ethers' entry. -b Broadcast the packet -i IFACE Interface to use (default eth0) -p PASSWORD Append four or six byte PASSWORD to the packet

expand

expand [-i] [-t N] [FILE]... Convert tabs to spaces, writing to stdout -i Dont convert tabs after non blanks -t Tabstops every N chars

expr

expr EXPRESSION Print the value of EXPRESSION EXPRESSION may be: ARG1 | ARG2 ARG1 if it is neither null nor 0, otherwise ARG2 ARG1 & ARG2 ARG1 if neither argument is null or 0, otherwise 0 ARG1 < ARG2 1 if ARG1 is less than ARG2, else 0. Similarly: ARG1 <= ARG2 ARG1 = ARG2 ARG1 != ARG2 ARG1 >= ARG2 ARG1 > ARG2 ARG1 + ARG2 Sum of ARG1 and ARG2. Similarly: ARG1 - ARG2 ARG1 * ARG2 ARG1 / ARG2 ARG1 % ARG2 STRING : REGEXP Anchored pattern match of REGEXP in STRING match STRING REGEXP Same as STRING : REGEXP substr STRING POS LEN Substring of STRING, POS counts from 1 index STRING CHARS Index in STRING where any CHARS is found, or 0 length STRING Length of STRING quote TOKEN Interpret TOKEN as a string, even if it is a keyword like match or an operator like / (EXPRESSION) Value of EXPRESSION Beware that many operators need to be escaped or quoted for shells. Comparisons are arithmetic if both ARGs are numbers, else lexicographical. Pattern matches return the string matched between \( and \) or null; if \( and \) are not used, they return the number of characters matched or 0.

factor

factor [NUMBER]... Print prime factors

fakeidentd

fakeidentd [-fiw] [-b ADDR] [STRING] Provide fake ident (auth) service -f Run in foreground -i Inetd mode -w Inetd wait mode -b ADDR Bind to specified address STRING Ident answer string (default: nobody)

fallocate

fallocate [-o OFS] -l LEN FILE Preallocate space for FILE -o OFS Offset of range -l LEN Length of range

fatattr

fatattr [-+rhsvda] FILE... Change file attributes on FAT filesystem - Clear attributes + Set attributes r Read only h Hidden s System v Volume label d Directory a Archive

fbset

fbset [OPTIONS] [MODE] Show and modify frame buffer settings

fbsplash

fbsplash -s IMGFILE [-c] [-d DEV] [-i INIFILE] [-f CMD] -s Image -c Hide cursor -d Framebuffer device (default /dev/fb0) -i Config file (var=value): BAR_LEFT,BAR_TOP,BAR_WIDTH,BAR_HEIGHT BAR_R,BAR_G,BAR_B,IMG_LEFT,IMG_TOP -f Control pipe (else exit after drawing image) commands: NN (% for progress bar) or exit

fdflush

fdflush DEVICE Force floppy disk drive to detect disk change

fdformat

fdformat [-n] DEVICE Format floppy disk -n Dont verify after format

fdisk

fdisk [-ul] [-C CYLINDERS] [-H HEADS] [-S SECTORS] [-b SSZ] DISK Change partition table -u Start and End are in sectors (instead of cylinders) -l Show partition table for each DISK, then exit -b 2048 (for certain MO disks) use 2048-byte sectors -C CYLINDERS Set number of cylinders/heads/sectors -H HEADS Typically 255 -S SECTORS Typically 63

fgconsole

fgconsole Get active console

find

find [-HL] [PATH]... [OPTIONS] [ACTIONS] Search for files and perform actions on them. First failed action stops processing of current file. Defaults: PATH is current directory, action is '-print' -L,-follow Follow symlinks -H ...on command line only -xdev Dont descend directories on other filesystems -maxdepth N Descend at most N levels. -maxdepth 0 applies actions to command line arguments only -mindepth N Dont act on first N levels -depth Act on directory *after* traversing it Actions: ( ACTIONS ) Group actions for -o / -a ! ACT Invert ACTs success/failure ACT1 [-a] ACT2 If ACT1 fails, stop, else do ACT2 ACT1 -o ACT2 If ACT1 succeeds, stop, else do ACT2 Note: -a has higher priority than -o -name PATTERN Match file name (w/o directory name) to PATTERN -iname PATTERN Case insensitive -name -path PATTERN Match path to PATTERN -ipath PATTERN Case insensitive -path -regex PATTERN Match path to regex PATTERN -type X File type is X (one of: f,d,l,b,c,s,p) -executable File is executable -perm MASK At least one mask bit (+MASK), all bits (-MASK), or exactly MASK bits are set in files mode -mtime DAYS mtime is greater than (+N), less than (-N), or exactly N days in the past -mmin MINS mtime is greater than (+N), less than (-N), or exactly N minutes in the past -newer FILE mtime is more recent than FILEs -inum N File has inode number N -user NAME/ID File is owned by given user -group NAME/ID File is owned by given group -size N[bck] File size is N (c:bytes,k:kbytes,b:512 bytes(def.)) +/-N: file size is bigger/smaller than N -links N Number of links is greater than (+N), less than (-N), or exactly N -empty Match empty file/directory -prune If current file is directory, dont descend into it If none of the following actions is specified, -print is assumed -print Print file name -print0 Print file name, NUL terminated -exec CMD ARG ; Run CMD with all instances of {} replaced by file name. Fails if CMD exits with nonzero -exec CMD ARG + Run CMD with {} replaced by list of file names -delete Delete current file/directory. Turns on -depth option -quit Exit

findfs

findfs LABEL=label or UUID=uuid Find a filesystem device based on a label or UUID

flock

flock [-sxun] FD | { FILE [-c] PROG ARGS } [Un]lock file descriptor, or lock FILE, run PROG -s Shared lock -x Exclusive lock (default) -u Unlock FD -n Fail rather than wait

fold

fold [-bs] [-w WIDTH] [FILE]... Wrap input lines in FILEs (or stdin), writing to stdout -b Count bytes rather than columns -s Break at spaces -w Use WIDTH columns instead of 80

free

free [-bkmgh] Display free and used memory

freeramdisk

freeramdisk DEVICE Free all memory used by the specified ramdisk

fsck

fsck [-ANPRTV] [-t FSTYPE] [FS_OPTS] [BLOCKDEV]... Check and repair filesystems -A Walk /etc/fstab and check all filesystems -N Dont execute, just show what would be done -P With -A, check filesystems in parallel -R With -A, skip the root filesystem -T Dont show title on startup -V Verbose -t TYPE List of filesystem types to check

fsck.minix

fsck.minix [-larvsmf] BLOCKDEV Check MINIX filesystem -l List all filenames -r Perform interactive repairs -a Perform automatic repairs -v Verbose -s Output superblock information -m Show "mode not cleared" warnings -f Force file system check

fsfreeze

fsfreeze --[un]freeze MOUNTPOINT Flush and halt writes to MOUNTPOINT

fstrim

fstrim [OPTIONS] MOUNTPOINT -o OFFSET Offset in bytes to discard from -l LEN Bytes to discard -m MIN Minimum extent length -v Print number of discarded bytes

fsync

fsync [-d] FILE... Write all buffered blocks in FILEs to disk -d Avoid syncing metadata

ftpd

ftpd [-wvS] [-a USER] [-t SEC] [-T SEC] [DIR] FTP server. Chroots to DIR, if this fails (run by non-root), cds to it. It is an inetd service, inetd.conf line: 21 stream tcp nowait root ftpd ftpd /files/to/serve Can be run from tcpsvd: tcpsvd -vE 0.0.0.0 21 ftpd /files/to/serve -w Allow upload -A No login required, client access occurs under ftpds UID -a USER Enable anonymous login and map it to USER -v Log errors to stderr. -vv: verbose log -S Log errors to syslog. -SS: verbose log -t,-T N Idle and absolute timeout

ftpget

ftpget [OPTIONS] HOST [LOCAL_FILE] REMOTE_FILE Download a file via FTP -c Continue previous transfer -v Verbose -u USER Username -p PASS Password -P PORT

ftpput

ftpput [OPTIONS] HOST [REMOTE_FILE] LOCAL_FILE Upload a file to a FTP server -v Verbose -u USER Username -p PASS Password -P PORT

fuser

fuser [-msk46] [-SIGNAL] FILE or PORT/PROTO Find processes which use FILEs or PORTs -m Find processes which use same fs as FILEs -4,-6 Search only IPv4/IPv6 space -s Dont display PIDs -k Kill found processes -SIGNAL Signal to send (default: KILL)

getopt

getopt [OPTIONS] [--] OPTSTRING PARAMS -a Allow long options starting with single - -l LOPT[,...] Long options to recognize -n PROGNAME The name under which errors are reported -o OPTSTRING Short options to recognize -q No error messages on unrecognized options -Q No normal output -s SHELL Set shell quoting conventions -T Version test (exits with 4) -u Dont quote output Example: O=`getopt -l bb: Ω- ab:c:: $@` || exit 1 eval set Ω- $O while true; do case $1 in -a) echo A; shift;; -b|--bb) echo B:'$2'; shift 2;; -c) case $2 in ") echo C; shift 2;; *) echo C:'$2'"; shift 2;; esac;; --) shift; break;; *) echo Error; exit 1;; esac done

getty

getty [OPTIONS] BAUD_RATE[,BAUD_RATE]... TTY [TERMTYPE] Open TTY, prompt for login name, then invoke /bin/login -h Enable hardware RTS/CTS flow control -L Set CLOCAL (ignore Carrier Detect state) -m Get baud rate from modems CONNECT status message -n Dont prompt for login name -w Wait for CR or LF before sending /etc/issue -i Dont display /etc/issue -f ISSUE_FILE Display ISSUE_FILE instead of /etc/issue -l LOGIN Invoke LOGIN instead of /bin/login -t SEC Terminate after SEC if no login name is read -I INITSTR Send INITSTR before anything else -H HOST Log HOST into the utmp file as the hostname BAUD_RATE of 0 leaves it unchanged

grep

grep [-HhnlLoqvsrRiwFE] [-m N] [-A|B|C N] { PATTERN | -e PATTERN... | -f FILE... } [FILE]... Search for PATTERN in FILEs (or stdin) -H Add filename: prefix -h Do not add filename: prefix -n Add line_no: prefix -l Show only names of files that match -L Show only names of files that dont match -c Show only count of matching lines -o Show only the matching part of line -q Quiet. Return 0 if PATTERN is found, 1 otherwise -v Select non-matching lines -s Suppress open and read errors -r Recurse -R Recurse and dereference symlinks -i Ignore case -w Match whole words only -x Match whole lines only -F PATTERN is a literal (not regexp) -E PATTERN is an extended regexp -m N Match up to N times per file -A N Print N lines of trailing context -B N Print N lines of leading context -C N Same as -A N -B N -e PTRN Pattern to match -f FILE Read pattern from file

groups

groups [USER] Print the groups USER is in

gunzip

gunzip [-cfkt] [FILE]... Decompress FILEs (or stdin) -c Write to stdout -f Force -k Keep input files -t Test integrity

gzip

gzip [-cfkdt123456789] [FILE]... Compress FILEs (or stdin) -1..9 Compression level -d Decompress -c Write to stdout -f Force -k Keep input files -t Test integrity

halt

halt [-d DELAY] [-nf] Halt the system -d SEC Delay interval -n Do not sync -f Force (dont go through init)

hd

hd FILE... hd is an alias for hexdump -C

hdparm

hdparm [OPTIONS] [DEVICE] -a Get/set fs readahead -A Set drive read-lookahead flag (0/1) -b Get/set bus state (0 == off, 1 == on, 2 == tristate) -B Set Advanced Power Management setting (1-255) -c Get/set IDE 32-bit IO setting -C Check IDE power mode status -d Get/set using_dma flag -D Enable/disable drive defect-mgmt -f Flush buffer cache for device on exit -g Display drive geometry -h Display terse usage information -i Display drive identification -I Detailed/current information directly from drive -k Get/set keep_settings_over_reset flag (0/1) -K Set drive keep_features_over_reset flag (0/1) -L Set drive doorlock (0/1) (removable harddisks only) -m Get/set multiple sector count -n Get/set ignore-write-errors flag (0/1) -p Set PIO mode on IDE interface chipset (0,1,2,3,4,...) -P Set drive prefetch count -Q Get/set DMA tagged-queuing depth (if supported) -r Get/set readonly flag (DANGEROUS to set) -R Register an IDE interface (DANGEROUS) -S Set standby (spindown) timeout -t Perform device read timings -T Perform cache read timings -u Get/set unmaskirq flag (0/1) -U Unregister an IDE interface (DANGEROUS) -v Defaults; same as -mcudkrag for IDE drives -V Display program version and exit immediately -w Perform device reset (DANGEROUS) -W Set drive write-caching flag (0/1) (DANGEROUS) -x Tristate device for hotswap (0/1) (DANGEROUS) -X Set IDE xfer mode (DANGEROUS) -y Put IDE drive in standby mode -Y Put IDE drive to sleep -Z Disable Seagate auto-powersaving mode -z Reread partition table

head

head [OPTIONS] [FILE]... Print first 10 lines of FILEs (or stdin). With more than one FILE, precede each with a filename header. -n N[bkm] Print first N lines -n -N[bkm] Print all except N last lines -c [-]N[bkm] Print first N bytes (b:*512 k:*1024 m:*1024^2) -q Never print headers -v Always print headers

hexdump

hexdump [-bcdoxCv] [-e FMT] [-f FMT_FILE] [-n LEN] [-s OFS] [FILE]... Display FILEs (or stdin) in a user specified format -b 1-byte octal display -c 1-byte character display -d 2-byte decimal display -o 2-byte octal display -x 2-byte hex display -C hex+ASCII 16 bytes per line -v Show all (no dup folding) -e FORMAT_STR Example: 16/1 "%02x|""\n" -f FORMAT_FILE -n LENGTH Show only first LENGTH bytes -s OFFSET Skip OFFSET bytes

hexedit

hexedit FILE Edit FILE in hexadecimal

hostid

hostid Print out a unique 32-bit identifier for the machine

hostname

hostname [-sidf] [HOSTNAME | -F FILE] Show or set hostname or DNS domain name -s Short -i Addresses for the hostname -d DNS domain name -f Fully qualified domain name -F FILE Use FILEs content as hostname

httpd

httpd [-ifv[v]] [-c CONFFILE] [-p [IP:]PORT] [-u USER[:GRP]] [-r REALM] [-h HOME] or httpd -d/-e/-m STRING Listen for incoming HTTP requests -i Inetd mode -f Dont daemonize -v[v] Verbose -p [IP:]PORT Bind to IP:PORT (default *:80) -u USER[:GRP] Set uid/gid after binding to port -r REALM Authentication Realm for Basic Authentication -h HOME Home directory (default .) -c FILE Configuration file (default {/etc,HOME}/httpd.conf) -m STRING MD5 crypt STRING -e STRING HTML encode STRING -d STRING URL decode STRING

hwclock

hwclock [-swul] [--systz] [-f DEV] Show or set hardware clock (RTC) -s Set system time from RTC -w Set RTC from system time --systz Set in-kernel timezone, correct system time if RTC is kept in local time -f DEV Use specified device (e.g. /dev/rtc2) -u Assume RTC is kept in UTC -l Assume RTC is kept in local time (if neither is given, read from /var/lib/hwclock/adjtime)

i2cdetect

i2cdetect -l | -F I2CBUS | [-ya] [-q|-r] I2CBUS [FIRST LAST] Detect I2C chips -l List installed buses -F BUS# List functionalities on this bus -y Disable interactive mode -a Force scanning of non-regular addresses -q Use smbus quick write commands for probing (default) -r Use smbus read byte commands for probing FIRST and LAST limit probing range

i2cdump

i2cdump [-fy] [-r FIRST-LAST] BUS ADDR [MODE] Examine I2C registers I2CBUS I2C bus number ADDRESS 0x03-0x77 MODE is: b Byte (default) w Word W Word on even register addresses i I2C block s SMBus block c Consecutive byte Append p for SMBus PEC -f Force access -y Disable interactive mode -r Limit the number of registers being accessed

i2cget

i2cget [-fy] BUS CHIP-ADDRESS [DATA-ADDRESS [MODE]] Read from I2C/SMBus chip registers I2CBUS I2C bus number ADDRESS 0x03-0x77 MODE is: b Read byte data (default) w Read word data c Write byte/read byte Append p for SMBus PEC -f Force access -y Disable interactive mode

i2cset

i2cset [-fy] [-m MASK] BUS CHIP-ADDRESS DATA-ADDRESS [VALUE] ... [MODE] Set I2C registers I2CBUS I2C bus number ADDRESS 0x03-0x77 MODE is: c Byte, no value b Byte data (default) w Word data i I2C block data s SMBus block data Append p for SMBus PEC -f Force access -y Disable interactive mode -r Read back and compare the result -m MASK Mask specifying which bits to write

i2ctransfer

i2ctransfer [-fay] I2CBUS { rLENGTH[@ADDR] | wLENGTH[@ADDR] DATA...}... Read/write I2C data in one transfer -f Force access to busy addresses -a Force access to non-regular addresses -y Disable interactive mode

id

id [-ugGnr] [USER] Print information about USER or the current user -u User ID -g Group ID -G Supplementary group IDs -n Print names instead of numbers -r Print real ID instead of effective ID

ifconfig

ifconfig [-a] [IFACE] [ADDRESS] Configure a network interface [add ADDRESS[/PREFIXLEN]] [del ADDRESS[/PREFIXLEN]] [[-]broadcast [ADDRESS]] [[-]pointopoint [ADDRESS]] [netmask ADDRESS] [dstaddr ADDRESS] [outfill NN] [keepalive NN] [hw ether|infiniband ADDRESS] [metric NN] [mtu NN] [[-]trailers] [[-]arp] [[-]allmulti] [multicast] [[-]promisc] [txqueuelen NN] [[-]dynamic] [mem_start NN] [io_addr NN] [irq NN] [up|down] ...

ifdown

ifdown [-nmvf] [-i FILE] -a | IFACE... -a Deconfigure all interfaces -i FILE Use FILE instead of /etc/network/interfaces -n Dry run (note: doesnt disable mappings) -m Dont run any mappings -v Print out what would happen before doing it -f Force

ifenslave

ifenslave [-cdf] MASTER_IFACE SLAVE_IFACE... Configure network interfaces for parallel routing -c Change active slave -d Remove slave interface from bonding device -f Force, even if interface is not Ethernet

ifplugd

ifplugd [OPTIONS] Network interface plug detection daemon -n Dont daemonize -s Dont log to syslog -i IFACE Interface -f/-F Treat link detection error as link down/link up (otherwise exit on error) -a Dont up interface at each link probe -M Monitor creation/destruction of interface (otherwise it must exist) -r PROG Script to run -x ARG Extra argument for script -I Dont exit on nonzero exit code from script -p Dont run "up" script on startup -q Dont run "down" script on exit -l Always run script on startup -t SECS Poll time in seconds -u SECS Delay before running script after link up -d SECS Delay after link down -m MODE API mode (mii, priv, ethtool, wlan, iff, auto) -k Kill running daemon

ifup

ifup [-nmvf] [-i FILE] -a | IFACE... -a Configure all interfaces -i FILE Use FILE instead of /etc/network/interfaces -n Dry run (note: doesnt disable mappings) -m Dont run any mappings -v Print out what would happen before doing it -f Force

inetd

inetd [-fe] [-q N] [-R N] [CONFFILE] Listen for network connections and launch programs -f Run in foreground -e Log to stderr -q N Socket listen queue (default 128) -R N Pause services after N connects/min (default 0 - disabled) Default CONFFILE is /etc/inetd.conf

init

init Init is the first process started during boot. It never exits. It (re)spawns children according to /etc/inittab. Signals: HUP: reload /etc/inittab TSTP: stop respawning until CONT QUIT: re-exec another init USR1/TERM/USR2/INT: run halt/reboot/poweroff/Ctrl-Alt-Del script

inotifyd

inotifyd PROG FILE1[:MASK]... Run PROG on filesystem changes. When a filesystem event matching MASK occurs on FILEn, PROG ACTUAL_EVENTS FILEn [SUBFILE] is run. If PROG is -, events are sent to stdout. Events: a File is accessed c File is modified e Metadata changed w Writable file is closed 0 Unwritable file is closed r File is opened D File is deleted M File is moved u Backing fs is unmounted o Event queue overflowed x File cant be watched anymore If watching a directory: y Subfile is moved into dir m Subfile is moved out of dir n Subfile is created d Subfile is deleted inotifyd waits for PROG to exit. When x event happens for all FILEs, inotifyd exits.

insmod

insmod FILE [SYMBOL=VALUE]... Load kernel module

install

install [-cdDsp] [-o USER] [-g GRP] [-m MODE] [-t DIR] [SOURCE]... DEST Copy files and set attributes -c Just copy (default) -d Create directories -D Create leading target directories -s Strip symbol table -p Preserve date -o USER Set ownership -g GRP Set group ownership -m MODE Set permissions -t DIR Install to DIR

ionice

ionice [-c 1-3] [-n 0-7] [-t] { -p PID | PROG ARGS } Change I/O priority and class -c N Class. 1:realtime 2:best-effort 3:idle -n N Priority -t Ignore errors

iostat

iostat [-c] [-d] [-t] [-z] [-k|-m] [ALL|BLOCKDEV...] [INTERVAL [COUNT]] Report CPU and I/O statistics -c Show CPU utilization -d Show device utilization -t Print current time -z Omit devices with no activity -k Use kb/s -m Use Mb/s

ip

ip [OPTIONS] address|route|link|tunnel|neigh|rule [ARGS] OPTIONS := -f[amily] inet|inet6|link | -o[neline] ip addr add|del IFADDR dev IFACE | show|flush [dev IFACE] [to PREFIX] ip route list|flush|add|del|change|append|replace|test ROUTE ip link set IFACE [up|down] [arp on|off] [multicast on|off] [promisc on|off] [mtu NUM] [name NAME] [qlen NUM] [address MAC] [master IFACE | nomaster] ip tunnel add|change|del|show [NAME] [mode ipip|gre|sit] [remote ADDR] [local ADDR] [ttl TTL] ip neigh show|flush [to PREFIX] [dev DEV] [nud STATE] ip rule [list] | add|del SELECTOR ACTION

ipaddr

ipaddr add|del IFADDR dev IFACE | show|flush [dev IFACE] [to PREFIX] ipaddr add|change|replace|delete dev IFACE [CONFFLAG-LIST] IFADDR IFADDR := PREFIX | ADDR peer PREFIX [broadcast ADDR|+|-] [anycast ADDR] [label STRING] [scope SCOPE] PREFIX := ADDR[/MASK] SCOPE := [host|link|global|NUMBER] CONFFLAG-LIST := [CONFFLAG-LIST] CONFFLAG CONFFLAG := [noprefixroute] ipaddr show|flush [dev IFACE] [scope SCOPE] [to PREFIX] [label PATTERN]

ipcalc

ipcalc [-bnmphs] ADDRESS[/PREFIX] [NETMASK] Calculate and display network settings from IP address -b Broadcast address -n Network address -m Default netmask for IP -p Prefix for IP/NETMASK -h Resolved host name -s No error messages

ipcrm

ipcrm [-MQS key] [-mqs id] Upper-case options MQS remove an object by shmkey value. Lower-case options remove an object by shmid value. -mM Remove memory segment after last detach -qQ Remove message queue -sS Remove semaphore

ipcs

ipcs [[-smq] -i SHMID] | [[-asmq] [-tcplu]] -i ID Show specific resource Resource specification: -m Shared memory segments -q Message queues -s Semaphore arrays -a All (default) Output format: -t Time -c Creator -p Pid -l Limits -u Summary

iplink

iplink set IFACE [up|down] [arp on|off] [multicast on|off] [promisc on|off] [mtu NUM] [name NAME] [qlen NUM] [address MAC] [master IFACE | nomaster] iplink add [link IFACE] IFACE [address MAC] type TYPE [ARGS] iplink delete IFACE type TYPE [ARGS] TYPE ARGS := vlan VLANARGS | vrf table NUM VLANARGS := id VLANID [protocol 802.1q|802.1ad] [reorder_hdr on|off] [gvrp on|off] [mvrp on|off] [loose_binding on|off] iplink show [IFACE]

ipneigh

ipneigh show|flush [to PREFIX] [dev DEV] [nud STATE]

iproute

iproute list|flush|add|del|change|append|replace|test ROUTE iproute list|flush SELECTOR SELECTOR := [root PREFIX] [match PREFIX] [proto RTPROTO] PREFIX := default|ADDR[/MASK] iproute get ADDR [from ADDR iif IFACE] [oif IFACE] [tos TOS] iproute add|del|change|append|replace|test ROUTE ROUTE := NODE_SPEC [INFO_SPEC] NODE_SPEC := PREFIX [table TABLE_ID] [proto RTPROTO] [scope SCOPE] [metric METRIC] INFO_SPEC := NH OPTIONS NH := [via [inet|inet6] ADDR] [dev IFACE] [src ADDR] [onlink] OPTIONS := [mtu [lock] NUM] [advmss [lock] NUM]

iprule

iprule [list] | add|del SELECTOR ACTION SELECTOR := [from PREFIX] [to PREFIX] [tos TOS] [fwmark FWMARK[/MASK]] [dev IFACE] [pref NUMBER] ACTION := [table TABLE_ID] [nat ADDR] [prohibit|reject|unreachable] [realms [SRCREALM/]DSTREALM] TABLE_ID := [local|main|default|NUMBER]

iptunnel

iptunnel add|change|del|show [NAME] [mode ipip|gre|sit] [remote ADDR] [local ADDR] [ttl TTL] iptunnel add|change|del|show [NAME] [mode ipip|gre|sit] [remote ADDR] [local ADDR] [[i|o]seq] [[i|o]key KEY] [[i|o]csum] [ttl TTL] [tos TOS] [[no]pmtudisc] [dev PHYS_DEV]

kbd_mode

kbd_mode [-a|k|s|u] [-C TTY] Report or set VT console keyboard mode -a Default (ASCII) -k Medium-raw (keycode) -s Raw (scancode) -u Unicode (utf-8) -C TTY Affect TTY

kill

kill [-l] [-SIG] PID... Send a signal (default: TERM) to given PIDs -l List all signal names and numbers

killall

killall [-lq] [-SIG] PROCESS_NAME... Send a signal (default: TERM) to given processes -l List all signal names and numbers -q Dont complain if no processes were killed

killall5

killall5 [-l] [-SIG] [-o PID]... Send a signal (default: TERM) to all processes outside current session -l List all signal names and numbers -o PID Dont signal this PID

klogd

klogd [-c N] [-n] Log kernel messages to syslog -c N Print to console messages more urgent than prio N (1-8) -n Run in foreground

less

less [-EFIMmNSRh~] [FILE]... View FILE (or stdin) one screenful at a time -E Quit once the end of a file is reached -F Quit if entire file fits on first screen -I Ignore case in all searches -M,-m Display status line with line numbers and percentage through the file -N Prefix line number to each line -S Truncate long lines -R Remove color escape codes in input -~ Suppress ~s displayed past EOF

link

link FILE LINK Create hard LINK to FILE

ln

ln [-sfnbtv] [-S SUF] TARGET... LINK|DIR Create a link LINK or DIR/TARGET to the specified TARGET(s) -s Make symlinks instead of hardlinks -f Remove existing destinations -n Dont dereference symlinks - treat like normal file -b Make a backup of the target (if exists) before link operation -S SUF Use suffix instead of ~ when making backup files -T Treat LINK as a file, not DIR -v Verbose

loadfont

loadfont < font Load a console font from stdin

loadkmap

loadkmap < keymap Load a binary keyboard translation table from stdin

logger

logger [-s] [-t TAG] [-p PRIO] [MESSAGE] Write MESSAGE (or stdin) to syslog -s Log to stderr as well as the system log -t TAG Log using the specified tag (defaults to user name) -p PRIO Priority (number or FACILITY.LEVEL pair)

login

login [-p] [-h HOST] [[-f] USER] Begin a new session on the system -f Dont authenticate (user already authenticated) -h HOST Host user came from (for network logins) -p Preserve environment $LOGIN_TIMEOUT Seconds (default 60, 0 - disable) $LOGIN_PRE_SUID_SCRIPT Execute before user ID change

logname

logname Print the name of the current user

logread

logread [-fF] Show messages in syslogd's circular buffer -f Output data as log grows -F Same as -f, but dump buffer first

losetup

losetup [-rP] [-o OFS] {-f|LOOPDEV} FILE: associate loop devices losetup -c LOOPDEV: reread file size losetup -d LOOPDEV: disassociate losetup -a: show status losetup -f: show next free loop device -o OFS Start OFS bytes into FILE -P Scan for partitions -r Read-only -f Show/use next free loop device

lpd

lpd SPOOLDIR [HELPER [ARGS]] SPOOLDIR must contain (symlinks to) device nodes or directories with names matching print queue names. In the first case, jobs are sent directly to the device. Otherwise each job is stored in queue directory and HELPER program is called. Name of file to print is passed in $DATAFILE variable. Example: tcpsvd -E 0 515 softlimit -m 999999 lpd /var/spool ./print

lpq

lpq [-P queue[@host[:port]]] [-U USERNAME] [-d JOBID]... [-fs] -P lp service to connect to (else uses $PRINTER) -d Delete jobs -f Force any waiting job to be printed -s Short display

lpr

lpr -P queue[@host[:port]] -U USERNAME -J TITLE -Vmh [FILE]... -P lp service to connect to (else uses $PRINTER) -m Send mail on completion -h Print banner page too -V Verbose

ls

ls [-1AaCxdLHRFplinshrSXvctu] [-w WIDTH] [FILE]... List directory contents -1 One column output -a Include names starting with . -A Like -a, but exclude . and .. -x List by lines -d List directory names, not contents -L Follow symlinks -H Follow symlinks on command line -R Recurse -p Append / to directory names -F Append indicator (one of */=@|) to names -l Long format -i List inode numbers -n List numeric UIDs and GIDs instead of names -s List allocated blocks -lc List ctime -lu List atime --full-time List full date/time -h Human readable sizes (1K 243M 2G) --group-directories-first -S Sort by size -X Sort by extension -v Sort by version -t Sort by mtime -tc Sort by ctime -tu Sort by atime -r Reverse sort order -w N Format N columns wide --color[={always,never,auto}]

lsattr

lsattr [-Radlpv] [FILE]... List ext2 file attributes -R Recurse -a Include names starting with . -d List directory names, not contents -l List long flag names -p List project ID -v List version/generation number

lsmod

lsmod List loaded kernel modules

lsof

lsof Show all open files

lspci

lspci [-mk] List all PCI devices -m Parsable output -k Show driver

lzcat

lzcat [FILE]... Decompress to stdout

lzma

lzma -d [-cfk] [FILE]... Decompress FILEs (or stdin) -d Decompress -c Write to stdout -f Force -k Keep input files -t Test integrity

lzopcat

lzopcat [-vF] [FILE]... -v Verbose -F Dont verify checksum

makedevs

makedevs [-d device_table] rootdir Create a range of special files as specified in a device table. Device table entries take the form of: <name> <type> <mode> <uid> <gid> <major> <minor> <start> <inc> <count> Where name is the file name, type can be one of: f Regular file d Directory c Character device b Block device p Fifo (named pipe) uid is the user id for the target file, gid is the group id for the target file. The rest of the entries (major, minor, etc) apply to to device special files. A '-' may be used for blank entries.

makemime

makemime [OPTIONS] [FILE]... Create multipart MIME-encoded message from FILEs -o FILE Output. Default: stdout -a HDR Add header(s). Examples: "From: user@host.org", "Date: `date -R`" -c CT Content type. Default: application/octet-stream -C CS Charset. Default: us-ascii Other options are silently ignored

man

man [-aw] [SECTION] MANPAGE[.SECTION]... Display manual page -a Display all pages -w Show page locations $COLUMNS overrides output width

md5sum

md5sum [-c[sw]] [FILE]... Print or check MD5 checksums -c Check sums against list in FILEs -s Dont output anything, status code shows success -w Warn about improperly formatted checksum lines

mdev

mdev [-vS] { [-s] | [-df] } -v verbose -S log to syslog too -s scan /sys and populate /dev -d daemon, listen on netlink -f stay in foreground Bare mdev is a kernel hotplug helper. To activate it: echo /sbin/mdev >/proc/sys/kernel/hotplug It uses /etc/mdev.conf with lines [-][ENV=regex;]...DEVNAME UID:GID PERM [>|=PATH]|[!] [@|$|*PROG] where DEVNAME is device name regex, @major,minor[-minor2], or environment variable regex. A common use of the latter is to load modules for hotplugged devices: $MODALIAS=.* 0:0 660 @modprobe "$MODALIAS" If /dev/mdev.seq file exists, mdev will wait for its value to match $SEQNUM variable. This prevents plug/unplug races. To activate this feature, create empty /dev/mdev.seq at boot. If /dev/mdev.log file exists, debug log will be appended to it.

mesg

mesg [y|n] Control write access to your terminal y Allow write access to your terminal n Disallow write access to your terminal

microcom

microcom [-d DELAY_MS] [-t TIMEOUT_MS ] [-s SPEED] [-X] TTY Copy bytes from stdin to TTY and from TTY to stdout -d DELAY Wait up to DELAY ms for TTY output before sending every next byte to it -t TIMEOUT Exit if both stdin and TTY are silent for TIMEOUT ms -s SPEED Set serial line to SPEED -X Disable special meaning of NUL and Ctrl-X from stdin

mkdir

mkdir [-m MODE] [-p] DIRECTORY... Create DIRECTORY -m MODE Mode -p No error if exists; make parent directories as needed

mkdosfs

mkdosfs [-v] [-n LABEL] BLOCKDEV [KBYTES] Make a FAT32 filesystem -v Verbose -n LBL Volume label

mke2fs

mke2fs [-Fn] [-b BLK_SIZE] [-i INODE_RATIO] [-I INODE_SIZE] [-m RESERVED_PERCENT] [-L LABEL] BLOCKDEV [KBYTES] -b BLK_SIZE Block size, bytes -F Force -i RATIO Max number of files is filesystem_size / RATIO -I BYTES Inode size (min 128) -L LBL Volume label -m PERCENT Percent of blocks to reserve for admin -n Dry run

mkfifo

mkfifo [-m MODE] NAME Create named pipe -m MODE Mode (default a=rw)

mkfs.ext2

mkfs.ext2 [-Fn] [-b BLK_SIZE] [-i INODE_RATIO] [-I INODE_SIZE] [-m RESERVED_PERCENT] [-L LABEL] BLOCKDEV [KBYTES] -b BLK_SIZE Block size, bytes -F Force -i RATIO Max number of files is filesystem_size / RATIO -I BYTES Inode size (min 128) -L LBL Volume label -m PERCENT Percent of blocks to reserve for admin -n Dry run

mkfs.minix

mkfs.minix [-c | -l FILE] [-nXX] [-iXX] BLOCKDEV [KBYTES] Make a MINIX filesystem -c Check device for bad blocks -n [14|30] Maximum length of filenames -i INODES Number of inodes for the filesystem -l FILE Read bad blocks list from FILE -v Make version 2 filesystem

mkfs.vfat

mkfs.vfat [-v] [-n LABEL] BLOCKDEV [KBYTES] Make a FAT32 filesystem -v Verbose -n LBL Volume label

mknod

mknod [-m MODE] NAME TYPE [MAJOR MINOR] Create a special file (block, character, or pipe) -m MODE Creation mode (default a=rw) TYPE: b Block device c or u Character device p Named pipe (MAJOR MINOR must be omitted)

mkpasswd

mkpasswd [-P FD] [-m TYPE] [-S SALT] [PASSWORD] [SALT] Print crypt (3) hashed PASSWORD -P N Read password from fd N -m TYPE des,md5,sha256/512 (default des) -S SALT

mkswap

mkswap [-L LBL] BLOCKDEV [KBYTES] Prepare BLOCKDEV to be used as swap partition -L LBL Label

mktemp

mktemp [-dt] [-p DIR] [TEMPLATE] Create a temporary file with name based on TEMPLATE and print its name. TEMPLATE must end with XXXXXX (e.g. [/dir/]nameXXXXXX). Without TEMPLATE, -t tmp.XXXXXX is assumed. -d Make directory, not file -q Fail silently on errors -t Prepend base directory name to TEMPLATE -p DIR Use DIR as a base directory (implies -t) -u Do not create anything; print a name Base directory is: -p DIR, else $TMPDIR, else /tmp

modinfo

modinfo [-adlpn0] [-F keyword] MODULE -a Shortcut for -F author -d Shortcut for -F description -l Shortcut for -F license -p Shortcut for -F parm -F keyword Keyword to look for -0 NUL terminated output

modprobe

modprobe [-rq] MODULE [SYMBOL=VALUE]... -r Remove MODULE -q Quiet

more

more [FILE]... View FILE (or stdin) one screenful at a time

mount

mount [OPTIONS] [-o OPT] DEVICE NODE Mount a filesystem. Filesystem autodetection requires /proc. -a Mount all filesystems in fstab -f Dry run -i Dont run mount helper -v Verbose -r Read-only mount -t FSTYPE[,...] Filesystem type(s) -T FILE Read FILE instead of /etc/fstab -O OPT Mount only filesystems with option OPT (-a only) -o OPT: loop Ignored (loop devices are autodetected) [a]sync Writes are [a]synchronous [no]atime Disable/enable updates to inode access times [no]diratime Disable/enable atime updates to directories [no]relatime Disable/enable atime updates relative to modification time [no]dev (Dis)allow use of special device files [no]exec (Dis)allow use of executable files [no]suid (Dis)allow set-user-id-root programs [r]shared Convert [recursively] to a shared subtree [r]slave Convert [recursively] to a slave subtree [r]private Convert [recursively] to a private subtree [un]bindable Make mount point [un]able to be bind mounted [r]bind Bind a file or directory [recursively] to another location move Relocate an existing mount point remount Remount a mounted filesystem, changing flags ro Same as -r There are filesystem-specific -o flags.

mountpoint

mountpoint [-q] { [-dn] DIR | -x DEVICE } Check if DIR is a mountpoint -q Quiet -d Print major:minor of the filesystem -n Print device name of the filesystem -x Print major:minor of DEVICE

mpstat

mpstat [-A] [-I SUM|CPU|ALL|SCPU] [-u] [-P num|ALL] [INTERVAL [COUNT]] Per-processor statistics -A Same as -I ALL -u -P ALL -I SUM|CPU|ALL|SCPU Report interrupt statistics -P num|ALL Processor to monitor -u Report CPU utilization

mt

mt [-f DEVICE] OPCODE VALUE Control magnetic tape drive operation Opcodes: bsf bsfm bsr bss datacompression drvbuffer eof eom erase fsf fsfm fsr fss load lock mkpart nop offline ras1 ras2 ras3 reset retension rewind rewoffline seek setblk setdensity setpart tell unload unlock weof wset

  1. mv [-finT] SOURCE DEST or: mv [-fin] SOURCE... { -t DIRECTORY | DIRECTORY } Rename SOURCE to DEST, or move SOURCEs to DIRECTORY -f Dont prompt before overwriting -i Interactive, prompt before overwrite -n Dont overwrite an existing file -T Refuse to move if DEST is a directory -t DIR Move all SOURCEs into DIR

nameif

nameif [-s] [-c FILE] [IFNAME HWADDR]... Rename network interface while it in the down state. The device with address HWADDR is renamed to IFNAME. -c FILE Configuration file (default: /etc/mactab) -s Log to syslog

nbd-client

nbd-client { [-b BLKSIZE] [-N NAME] [-t SEC] [-p] HOST [PORT] | -d } BLOCKDEV Connect to HOST and provide network block device on BLOCKDEV

nc

nc [OPTIONS] HOST PORT - connect nc [OPTIONS] -l -p PORT [HOST] [PORT] - listen -e PROG Run PROG after connect (must be last) -l Listen mode, for inbound connects -lk With -e, provides persistent server -p PORT Local port -s ADDR Local address -w SEC Timeout for connects and final net reads -i SEC Delay interval for lines sent -n Dont do DNS resolution -u UDP mode -b Allow broadcasts -v Verbose -o FILE Hex dump traffic -z Zero-I/O mode (scanning)

netstat

netstat [-ral] [-tuwx] [-enWp] Display networking information -r Routing table -a All sockets -l Listening sockets Else: connected sockets -t TCP sockets -u UDP sockets -w Raw sockets -x Unix sockets Else: all socket types -e Other/more information -n Dont resolve names -W Wide display -p Show PID/program name for sockets

nice

nice [-n ADJUST] [PROG ARGS] Change scheduling priority, run PROG -n ADJUST Adjust priority by ADJUST

nl

nl [OPTIONS] [FILE]... Write FILEs to standard output with line numbers added -b STYLE Which lines to number - a: all, t: nonempty, n: none -i N Line number increment -s STRING Use STRING as line number separator -v N Start from N -w N Width of line numbers

nmeter

nmeter [-d MSEC] FORMAT_STRING Monitor system in real time -d MSEC Milliseconds between updates, default:1000, none:-1 Format specifiers: %Nc or %[cN] CPU. N - bar size (default 10) (displays: S:system U:user N:niced D:iowait I:irq i:softirq) %[nINTERFACE] Network INTERFACE %m Allocated memory %[mf] Free memory %[mt] Total memory %s Allocated swap %f Number of used file descriptors %Ni Total/specific IRQ rate %x Context switch rate %p Forks %[pn] # of processes %b Block io %Nt Time (with N decimal points) %NT Zero-based timestamp (with N decimal points) %r Print <cr> instead of <lf> at EOL

nohup

nohup PROG ARGS Run PROG immune to hangups, with output to a non-tty

nproc

nproc [--all] [--ignore=N] Print number of available CPUs --all Number of installed CPUs --ignore=N Exclude N CPUs

nsenter

nsenter [OPTIONS] [PROG ARGS] -t PID Target process to get namespaces from -m[FILE] Enter mount namespace -u[FILE] Enter UTS namespace (hostname etc) -i[FILE] Enter System V IPC namespace -n[FILE] Enter network namespace -p[FILE] Enter pid namespace -U[FILE] Enter user namespace -S UID Set uid in entered namespace -G GID Set gid in entered namespace --preserve-credentials Dont touch uids or gids -r[DIR] Set root directory -w[DIR] Set working directory -F Dont fork before execing PROG

nslookup

nslookup [-type=QUERY_TYPE] [-debug] HOST [DNS_SERVER] Query DNS about HOST QUERY_TYPE: soa,ns,a,aaaa,cname,mx,txt,ptr,srv,any

ntpd

ntpd [-dnqNwl] [-I IFACE] [-S PROG] [-k KEYFILE] [-p [keyno:N:]PEER]... NTP client/server -d[d] Verbose -n Do not daemonize -q Quit after clock is set -N Run at high priority -w Do not set time (only query peers), implies -n -S PROG Run PROG after stepping time, stratum change, and every 11 min -k FILE Key file (ntp.keys compatible) -p [keyno:NUM:]PEER Obtain time from PEER (may be repeated) Use key NUM for authentication If -p is not given, server HOST lines from /etc/ntp.conf are used -l Also run as server on port 123 -I IFACE Bind server to IFACE, implies -l

od

od [-abcdfhilovxs] [-t TYPE] [-A RADIX] [-N SIZE] [-j SKIP] [-S MINSTR] [-w WIDTH] [FILE]... Print FILEs (or stdin) unambiguously, as octal bytes by default

openvt

openvt [-c N] [-sw] [PROG ARGS] Start PROG on a new virtual terminal -c N Use specified VT -s Switch to the VT -w Wait for PROG to exit

partprobe

partprobe DEVICE... Ask kernel to rescan partition table

passwd

passwd [-a ALG] [-dlu] [USER] Change USER's password (default: current user) -a ALG des,md5,sha256/512 (default des) -d Set password to -l Lock (disable) account -u Unlock (enable) account

paste

paste [-d LIST] [-s] [FILE]... Paste lines from each input file, separated with tab -d LIST Use delimiters from LIST, not tab -s Serial: one file at a time

patch

patch [-RNE] [-p N] [-i DIFF] [ORIGFILE [PATCHFILE]] -p N Strip N leading components from file names -i DIFF Read DIFF instead of stdin -R Reverse patch -N Ignore already applied patches -E Remove output files if they become empty --dry-run Dont actually change files

pgrep

pgrep [-flanovx] [-s SID|-P PPID|PATTERN] Display process(es) selected by regex PATTERN -l Show command name too -a Show command line too -f Match against entire command line -n Show the newest process only -o Show the oldest process only -v Negate the match -x Match whole name (not substring) -s Match session ID (0 for current) -P Match parent process ID

pidof

pidof [-s] [-o PID] [NAME]... List PIDs of all processes with names that match NAMEs -s Show only one PID -o PID Omit given pid Use %PPID to omit pid of pidofs parent

ping

ping [OPTIONS] HOST Send ICMP ECHO_REQUESTs to HOST -4,-6 Force IP or IPv6 name resolution -c CNT Send only CNT pings -s SIZE Send SIZE data bytes in packets (default 56) -i SECS Interval -A Ping as soon as reply is recevied -t TTL Set TTL -I IFACE/IP Source interface or IP address -W SEC Seconds to wait for the first response (default 10) (after all -c CNT packets are sent) -w SEC Seconds until ping exits (default:infinite) (can exit earlier with -c CNT) -q Quiet, only display output at start/finish -p HEXBYTE Payload pattern

ping6

ping6 [OPTIONS] HOST Send ICMP ECHO_REQUESTs to HOST -c CNT Send only CNT pings -s SIZE Send SIZE data bytes in packets (default 56) -i SECS Interval -A Ping as soon as reply is recevied -I IFACE/IP Source interface or IP address -W SEC Seconds to wait for the first response (default 10) (after all -c CNT packets are sent) -w SEC Seconds until ping exits (default:infinite) (can exit earlier with -c CNT) -q Quiet, only display output at start/finish -p HEXBYTE Payload pattern

pivot_root

pivot_root NEW_ROOT PUT_OLD Move the current root file system to PUT_OLD and make NEW_ROOT the new root file system

pkill

pkill [-l|-SIGNAL] [-xfvno] [-s SID|-P PPID|PATTERN] Send signal to processes selected by regex PATTERN -l List all signals -x Match whole name (not substring) -f Match against entire command line -s SID Match session ID (0 for current) -P PPID Match parent process ID -v Negate the match -n Signal the newest process only -o Signal the oldest process only

pmap

pmap [-xq] PID... Display process memory usage -x Show details -q Quiet

popmaildir

popmaildir [OPTIONS] MAILDIR [CONN_HELPER ARGS] Fetch content of remote mailbox to local maildir -s Skip authorization -T Get messages with TOP instead of RETR -k Keep retrieved messages on the server -t SEC Network timeout -F PROG ARGS Filter program (may be repeated) -M PROG ARGS Delivery program Fetch from plain POP3 server: popmaildir -k DIR nc pop3.server.com 110 <user_and_pass.txt Fetch from SSLed POP3 server and delete fetched emails: popmaildir DIR Ω- openssl s_client -quiet -connect pop3.server.com:995 <user_and_pass.txt

poweroff

poweroff [-d DELAY] [-nf] Halt and shut off power -d SEC Delay interval -n Do not sync -f Force (dont go through init)

powertop

powertop Analyze power consumption on Intel-based laptops

printenv

printenv [VARIABLE]... Print environment VARIABLEs. If no VARIABLE specified, print all.

printf

printf FORMAT [ARG]... Format and print ARG(s) according to FORMAT (a-la C printf)

ps

ps [-o COL1,COL2=HEADER] [-T] Show list of processes -o COL1,COL2=HEADER Select columns for display -T Show threads

pscan

pscan [-cb] [-p MIN_PORT] [-P MAX_PORT] [-t TIMEOUT] [-T MIN_RTT] HOST Scan HOST, print all open ports -c Show closed ports too -b Show blocked ports too -p PORT Scan from this port (default 1) -P PORT Scan up to this port (default 1024) -t MS Timeout (default 5000 ms) -T MS Minimum rtt (default 5 ms)

pstree

pstree [-p] [PID|USER] Display process tree, optionally start from USER or PID -p Show pids

pwd

pwd Print the full filename of the current working directory

pwdx

pwdx PID... Show current directory for PIDs

raidautorun

raidautorun DEVICE Tell the kernel to automatically search and start RAID arrays

rdate

rdate [-s/-p] HOST Set and print time from HOST using RFC 868 -s Only set system time -p Only print time

rdev

rdev Print the device node associated with the filesystem mounted at '/'

readahead

readahead [FILE]... Preload FILEs to RAM

readlink

readlink [-fnv] FILE Display the value of a symlink -f Canonicalize by following all symlinks -n Dont add newline -v Verbose

readprofile

readprofile [OPTIONS] -m MAPFILE (Default: /boot/System.map) -p PROFILE (Default: /proc/profile) -M NUM Set the profiling multiplier to NUM -i Print only info about the sampling step -v Verbose -a Print all symbols, even if count is 0 -b Print individual histogram-bin counts -s Print individual counters within functions -r Reset all the counters (root only) -n Disable byte order auto-detection

realpath

realpath FILE... Print absolute pathnames of FILEs

reboot

reboot [-d DELAY] [-nf] Reboot the system -d SEC Delay interval -n Do not sync -f Force (dont go through init)

reformime

reformime [OPTIONS] Parse MIME-encoded message on stdin -x PREFIX Extract content of MIME sections to files -X PROG ARGS Filter content of MIME sections through PROG Must be the last option Other options are silently ignored

renice

renice [-n] PRIORITY [[-p|g|u] ID...]... Change scheduling priority of a running process -n Add PRIORITY to current nice value Without -n, nice value is set to PRIORITY -p Process ids (default) -g Process group ids -u Process user names

reset

reset Reset the screen

resize

resize Resize the screen

resume

resume BLOCKDEV [OFFSET] Restore system state from 'suspend-to-disk' data in BLOCKDEV

rev

rev [FILE]... Reverse lines of FILE

rfkill

rfkill COMMAND [INDEX|TYPE] Enable/disable wireless devices Commands: list [INDEX|TYPE] List current state block INDEX|TYPE Disable device unblock INDEX|TYPE Enable device TYPE: all, wlan(wifi), bluetooth, uwb(ultrawideband), wimax, wwan, gps, fm

rm

rm [-irf] FILE... Remove (unlink) FILEs -i Always prompt before removing -f Never prompt -R,-r Recurse

rmdir

rmdir [-p] DIRECTORY... Remove DIRECTORY if it is empty -p Include parents --ignore-fail-on-non-empty

rmmod

rmmod MODULE... Unload kernel modules

route

route [-ne] [-A inet[6]] [{add|del} [-net|-host] TARGET [netmask MASK] [gw GATEWAY] [metric N] [mss BYTES] [window BYTES] [reject] [IFACE]] Show or edit kernel routing tables -n Dont resolve names -e Display other/more information -A inet[6] Select address family

rpm2cpio

rpm2cpio PACKAGE.rpm Output a cpio archive of the rpm file

rtcwake

rtcwake [-a | -l | -u] [-d DEV] [-m MODE] [-s SEC | -t TIME] Enter a system sleep state until specified wakeup time -a Read clock mode from /var/lib/hwclock/adjtime (default) -l Clock is set to local time -u Clock is set to UTC time -d DEV Specify the RTC device -m MODE Set sleep state (default: standby) -s SEC Set timeout in SEC seconds from now -t TIME Set timeout to TIME seconds from epoch

run-init

run-init [-d CAP,CAP...] [-n] [-c CONSOLE_DEV] NEW_ROOT NEW_INIT [ARGS] Free initramfs and switch to another root fs: chroot to NEW_ROOT, delete all in /, move NEW_ROOT to /, execute NEW_INIT. PID must be 1. NEW_ROOT must be a mountpoint. -c DEV Reopen stdio to DEV after switch -d CAPS Drop capabilities -n Dry run

run-parts

run-parts [-a ARG]... [-u UMASK] [--reverse] [--test] [--exit-on-error] [--list] DIRECTORY Run a bunch of scripts in DIRECTORY -a ARG Pass ARG as argument to scripts -u UMASK Set UMASK before running scripts --reverse Reverse execution order --test Dry run --exit-on-error Exit if a script exits with non-zero --list Print names of matching files even if they are not executable

runsv

runsv DIR Start and monitor a service and optionally an appendant log service

runsvdir

runsvdir [-P] [-s SCRIPT] DIR Start a runsv process for each subdirectory. If it exits, restart it. -P Put each runsv in a new session -s SCRIPT Run SCRIPT <signo> after signal is processed

rx

rx FILE Receive a file using the xmodem protocol

script

script [-afq] [-t[FILE]] [-c PROG] [OUTFILE] Default OUTFILE is 'typescript' -a Append output -c PROG Run PROG, not shell -q Quiet -t[FILE] Send timing to stderr or FILE

scriptreplay

scriptreplay TIMINGFILE [TYPESCRIPT [DIVISOR]] Play back typescripts, using timing information

sed

sed [-i[SFX]] [-nrE] [-f FILE]... [-e CMD]... [FILE]... or: sed [-i[SFX]] [-nrE] CMD [FILE]... -e CMD Add CMD to sed commands to be executed -f FILE Add FILE contents to sed commands to be executed -i[SFX] Edit files in-place (otherwise write to stdout) Optionally back files up, appending SFX -n Suppress automatic printing of pattern space -r,-E Use extended regex syntax If no -e or -f, the first non-option argument is the sed command string. Remaining arguments are input files (stdin if none).

sendmail

sendmail [-tv] [-f SENDER] [-amLOGIN 4<user_pass.txt | -auUSER -apPASS] [-w SECS] [-H 'PROG ARGS' | -S HOST] [RECIPIENT_EMAIL]... Read email from stdin and send it Standard options: -t Read additional recipients from message body -f SENDER For use in MAIL FROM:<sender>. Can be empty string Default: -auUSER, or username of current UID -o OPTIONS Various options. -oi implied, others are ignored -i -oi synonym, implied and ignored Busybox specific options: -v Verbose -w SECS Network timeout -H PROG ARGS Run connection helper. Examples: openssl s_client -quiet -tls1 -starttls smtp -connect smtp.gmail.com:25 openssl s_client -quiet -tls1 -connect smtp.gmail.com:465 $SMTP_ANTISPAM_DELAY: seconds to wait after helper connect -S HOST[:PORT] Server (default $SMTPHOST or 127.0.0.1) -amLOGIN Log in using AUTH LOGIN -amPLAIN or AUTH PLAIN (-amCRAM-MD5 not supported) -auUSER Username for AUTH -apPASS Password for AUTH If no -a options are given, authentication is not done. If -amLOGIN is given but no -au/-ap, user/password is read from fd #4. Other options are silently ignored; -oi is implied. Use makemime to create emails with attachments.

seq

seq [-w] [-s SEP] [FIRST [INC]] LAST Print numbers from FIRST to LAST, in steps of INC. FIRST, INC default to 1. -w Pad to last with leading zeros -s SEP String separator

setarch

setarch PERSONALITY [-R] PROG ARGS PERSONALITY may be: linux32 Set 32bit uname emulation linux64 Set 64bit uname emulation -R Disable address space randomization

setconsole

setconsole [-r] [DEVICE] Make writes to /dev/console appear on DEVICE (default: /dev/tty). Does not redirect kernel log output or reads from /dev/console. -r Reset: writes to /dev/console go to kernel log tty(s)

setfattr

setfattr [-h] -n|-x ATTR [-v VALUE] FILE... Set extended attributes -h Do not follow symlinks -x ATTR Remove attribute ATTR -n ATTR Set attribute ATTR to VALUE -v VALUE (default: empty)

setfont

setfont [-m MAPFILE] [-C TTY] FILE Load a console font -m MAPFILE Load console screen map -C TTY Affect TTY instead of /dev/tty

setkeycodes

setkeycodes { SCANCODE KEYCODE }... Modify kernel's scancode-to-keycode map, allowing unusual keyboards to generate usable keycodes. SCANCODE is either xx or e0xx (hexadecimal), KEYCODE is decimal.

setlogcons

setlogcons [N] Pin kernel output to VT console N. Default:0 (do not pin)

setpriv

setpriv [OPTIONS] PROG ARGS Run PROG with different privilege settings -d,--dump Show current capabilities --nnp,--no-new-privs Ignore setuid/setgid bits and file capabilities --inh-caps CAP,CAP Set inheritable capabilities --ambient-caps CAP,CAP Set ambient capabilities

setserial

setserial [-abGvz] { DEVICE [PARAMETER [ARG]]... | -g DEVICE... } Print or set serial port parameters -a Print all -b Print summary -G Print as setserial PARAMETERs -v Verbose -z Zero out serial flags before setting -g All args are device names PARAMETERs: (* = takes ARG, ^ = can be turned off by preceding ^) *port, *irq, *divisor, *uart, *baud_base, *close_delay, *closing_wait, ^fourport, ^auto_irq, ^skip_test, ^sak, ^session_lockout, ^pgrp_lockout, ^callout_nohup, ^split_termios, ^hup_notify, ^low_latency, autoconfig, spd_normal, spd_hi, spd_vhi, spd_shi, spd_warp, spd_cust ARG for uart: unknown, 8250, 16450, 16550, 16550A, Cirrus, 16650, 16650V2, 16750, 16950, 16954, 16654, 16850, RSA, NS16550A, XSCALE, RM9000, OCTEON, AR7, U6_16550A

setsid

setsid [-c] PROG ARGS Run PROG in a new session. PROG will have no controlling terminal and will not be affected by keyboard signals (^C etc). -c Set controlling terminal to stdin

setuidgid

setuidgid USER PROG ARGS Set uid and gid to USER's uid and gid, drop supplementary group ids, run PROG

sh

sh [-il] [-|+Cabefmnuvx] [-|+o OPT]... [-c 'SCRIPT' [ARG0 ARGS] | FILE [ARGS] | -s [ARGS]] Unix shell interpreter

sha1sum

sha1sum [-c[sw]] [FILE]... Print or check SHA1 checksums -c Check sums against list in FILEs -s Dont output anything, status code shows success -w Warn about improperly formatted checksum lines

sha256sum

sha256sum [-c[sw]] [FILE]... Print or check SHA256 checksums -c Check sums against list in FILEs -s Dont output anything, status code shows success -w Warn about improperly formatted checksum lines

sha3sum

sha3sum [-c[sw]] [-a BITS] [FILE]... Print or check SHA3 checksums -c Check sums against list in FILEs -s Dont output anything, status code shows success -w Warn about improperly formatted checksum lines -a BITS 224 (default), 256, 384, 512

sha512sum

sha512sum [-c[sw]] [FILE]... Print or check SHA512 checksums -c Check sums against list in FILEs -s Dont output anything, status code shows success -w Warn about improperly formatted checksum lines

showkey

showkey [-a | -k | -s] Show keys pressed -a Display decimal/octal/hex values of the keys -k Display interpreted keycodes (default) -s Display raw scan-codes

shred

shred [-fuz] [-n N] [-s SIZE] FILE... Overwrite/delete FILEs -f Chmod to ensure writability -s SIZE Size to write -n N Overwrite N times (default 3) -z Final overwrite with zeros -u Remove file

shuf

shuf [-e|-i L-H] [-n NUM] [-o FILE] [-z] [FILE|ARG...] Randomly permute lines -e Treat ARGs as lines -i L-H Treat numbers L-H as lines -n NUM Output at most NUM lines -o FILE Write to FILE, not standard output -z End lines with zero byte, not newline

slattach

slattach [-ehmLF] [-c SCRIPT] [-s BAUD] [-p PROTOCOL] SERIAL_DEVICE Configure serial line as SLIP network interface -p PROT Protocol: slip, cslip (default), slip6, clisp6, adaptive -s BAUD Line speed -e Exit after initialization -h Exit if carrier is lost (else never exits) -c PROG Run PROG on carrier loss -m Do NOT set raw 8bit mode -L Enable 3-wire operation -F Disable RTS/CTS flow control

sleep

sleep [N]... Pause for a time equal to the total of the args given, where each arg can have an optional suffix of (s)econds, (m)inutes, (h)ours, or (d)ays

smemcap

smemcap >SMEMDATA.TAR Collect memory usage data in /proc and write it to stdout

softlimit

softlimit [-a BYTES] [-m BYTES] [-d BYTES] [-s BYTES] [-l BYTES] [-f BYTES] [-c BYTES] [-r BYTES] [-o N] [-p N] [-t N] PROG ARGS Set soft resource limits, then run PROG -a BYTES Limit total size of all segments -m BYTES Same as -d BYTES -s BYTES -l BYTES -a BYTES -d BYTES Limit data segment -s BYTES Limit stack segment -l BYTES Limit locked memory size -o N Limit number of open files per process -p N Limit number of processes per uid Options controlling file sizes: -f BYTES Limit output file sizes -c BYTES Limit core file size Efficiency opts: -r BYTES Limit resident set size -t N Limit CPU time, process receives a SIGXCPU after N seconds

sort

sort [-nrugMcszbdfiokt] [-o FILE] [-k START[.OFS][OPTS][,END[.OFS][OPTS]] [-t CHAR] [FILE]... Sort lines of text -o FILE Output to FILE -c Check whether input is sorted -b Ignore leading blanks -f Ignore case -i Ignore unprintable characters -d Dictionary order (blank or alphanumeric only) -n Sort numbers -g General numerical sort -M Sort month -V Sort version -t CHAR Field separator -k N[,M] Sort by Nth field -r Reverse sort order -s Stable (dont sort ties alphabetically) -u Suppress duplicate lines -z NUL terminated input and output

split

split [OPTIONS] [INPUT [PREFIX]] -b N[k|m] Split by N (kilo|mega)bytes -l N Split by N lines -a N Use N letters as suffix

ssl_client

ssl_client [-e] -s FD [-r FD] [-n SNI]

start-stop-daemon

start-stop-daemon [OPTIONS] [-S|-K] ... [-- ARGS...] Search for matching processes, and then -K: stop all matching processes -S: start a process unless a matching process is found Process matching: -u USERNAME|UID Match only this users processes -n NAME Match processes with NAME in comm field in /proc/PID/stat -x EXECUTABLE Match processes with this command in /proc/PID/cmdline -p FILE Match a process with PID from FILE All specified conditions must match -S only: -x EXECUTABLE Program to run -a NAME Zeroth argument -b Background -N N Change nice level -c USER[:[GRP]] Change user/group -m Write PID to pidfile specified by -p -K only: -s SIG Signal to send -t Match only, exit with 0 if found Other: -o Exit with status 0 if nothing is done -v Verbose -q Quiet

stat

stat [-ltf] [-c FMT] FILE... Display file (default) or filesystem status -c FMT Use the specified format -f Display filesystem status -L Follow links -t Terse display FMT sequences for files: %a Access rights in octal %A Access rights in human readable form %b Number of blocks allocated (see %B) %B Size in bytes of each block reported by %b %d Device number in decimal %D Device number in hex %f Raw mode in hex %F File type %g Group ID %G Group name %h Number of hard links %i Inode number %n File name %N File name, with -> TARGET if symlink %o I/O block size %s Total size in bytes %t Major device type in hex %T Minor device type in hex %u User ID %U User name %x Time of last access %X Time of last access as seconds since Epoch %y Time of last modification %Y Time of last modification as seconds since Epoch %z Time of last change %Z Time of last change as seconds since Epoch FMT sequences for file systems: %a Free blocks available to non-superuser %b Total data blocks %c Total file nodes %d Free file nodes %f Free blocks %i File System ID in hex %l Maximum length of filenames %n File name %s Block size (for faster transfer) %S Fundamental block size (for block counts) %t Type in hex %T Type in human readable form

strings

strings [-fo] [-t o|d|x] [-n LEN] [FILE]... Display printable strings in a binary file -f Precede strings with filenames -o Precede strings with octal offsets -t o|d|x Precede strings with offsets in base 8/10/16 -n LEN At least LEN characters form a string (default 4)

stty

stty [-a|g] [-F DEVICE] [SETTING]... Without arguments, prints baud rate, line discipline, and deviations from stty sane -F DEVICE Open device instead of stdin -a Print all current settings in human-readable form -g Print in stty-readable form [SETTING] See manpage

su

su [-lmp] [-s SH] [-] [USER [FILE ARGS | -c 'CMD' [ARG0 ARGS]]] Run shell under USER (by default, root) -,-l Clear environment, go to home dir, run shell as login shell -p,-m Do not set new $HOME, $SHELL, $USER, $LOGNAME -c CMD Command to pass to sh -c -s SH Shell to use instead of users default

sulogin

sulogin [-t N] [TTY] Single user login -t N Timeout

sum

sum [-rs] [FILE]... Checksum and count the blocks in a file -r Use BSD sum algorithm (1K blocks) -s Use System V sum algorithm (512byte blocks)

sv

sv [-v] [-w SEC] CMD SERVICE_DIR... Control services monitored by runsv supervisor. Commands (only first character is enough): status: query service status up: if service isn't running, start it. If service stops, restart it once: like 'up', but if service stops, don't restart it down: send TERM and CONT signals. If ./run exits, start ./finish if it exists. After it stops, don't restart service exit: send TERM and CONT signals to service and log service. If they exit, runsv exits too pause, cont, hup, alarm, interrupt, quit, 1, 2, term, kill: send STOP, CONT, HUP, ALRM, INT, QUIT, USR1, USR2, TERM, KILL signal to service

svc

svc [-udopchaitkx] SERVICE_DIR... Control services monitored by runsv supervisor -u If service is not running, start it; restart if it stops -d If service is running, send TERM+CONT signals; do not restart it -o Once: if service is not running, start it; do not restart it -pchaitk Send STOP, CONT, HUP, ALRM, INT, TERM, KILL signal to service -x Exit: runsv will exit as soon as the service is down

svlogd

svlogd [-tttv] [-r C] [-R CHARS] [-l MATCHLEN] [-b BUFLEN] DIR... Read log data from stdin and write to rotated log files in DIRs -r C Replace non-printable characters with C -R CHARS Also replace CHARS with C (default _) -t Timestamp with @tai64n -tt Timestamp with yyyy-mm-dd_hh:mm:ss.sssss -ttt Timestamp with yyyy-mm-ddThh:mm:ss.sssss -v Verbose DIR/config file modifies behavior: sSIZE - when to rotate logs (default 1000000, 0 disables) nNUM - number of files to retain !PROG - process rotated log with PROG +,-PATTERN - (de)select line for logging E,ePATTERN - (de)select line for stderr

svok

svok SERVICE_DIR Check whether runsv supervisor is running. Exit code is 0 if it does, 100 if it does not, 111 (with error message) if SERVICE_DIR does not exist.

swapoff

swapoff [-a] [DEVICE] Stop swapping on DEVICE -a Stop swapping on all swap devices

swapon

swapon [-a] [-e] [-d[POL]] [-p PRI] [DEVICE] Start swapping on DEVICE -a Start swapping on all swap devices -d[POL] Discard blocks at swapon (POL=once), as freed (POL=pages), or both (POL omitted) -e Silently skip devices that do not exist -p PRI Set swap device priority

switch_root

switch_root [-c CONSOLE_DEV] NEW_ROOT NEW_INIT [ARGS] Free initramfs and switch to another root fs: chroot to NEW_ROOT, delete all in /, move NEW_ROOT to /, execute NEW_INIT. PID must be 1. NEW_ROOT must be a mountpoint. -c DEV Reopen stdio to DEV after switch

sync

sync [-df] [FILE]... Write all buffered blocks (in FILEs) to disk -d Avoid syncing metadata -f Sync filesystems underlying FILEs

sysctl

sysctl [-enq] { -a | -p [FILE]... | [-w] [KEY[=VALUE]]... } Show/set kernel parameters -e Dont warn about unknown keys -n Dont show key names -q Quiet -a Show all values -p Set values from FILEs (default /etc/sysctl.conf) -w Set values

syslogd

syslogd [OPTIONS] System logging utility -n Run in foreground -R HOST[:PORT] Log to HOST:PORT (default PORT:514) -L Log locally and via network (default is network only if -R) -C[size_kb] Log to shared mem buffer (use logread to read it) -K Log to kernel printk buffer (use dmesg to read it) -O FILE Log to FILE (default: /var/log/messages, stdout if -) -s SIZE Max size (KB) before rotation (default 200KB, 0=off) -b N N rotated logs to keep (default 1, max 99, 0=purge) -l N Log only messages more urgent than prio N (1-8) -S Smaller output -t Strip client-generated timestamps -D Drop duplicates -f FILE Use FILE as config (default:/etc/syslog.conf)

tac

tac [FILE]... Concatenate FILEs and print them in reverse

tail

tail [OPTIONS] [FILE]... Print last 10 lines of FILEs (or stdin) to. With more than one FILE, precede each with a filename header. -c [+]N[bkm] Print last N bytes -n N[bkm] Print last N lines -n +N[bkm] Start on Nth line and print the rest (b:*512 k:*1024 m:*1024^2) -q Never print headers -v Always print headers -f Print data as file grows -F Same as -f, but keep retrying -s SECONDS Wait SECONDS between reads with -f

tar

tar c|x|t [-ZzJjahvokO] [-f TARFILE] [-C DIR] [-T FILE] [-X FILE] [LONGOPT]... [FILE]... Create, extract, or list files from a tar file c Create x Extract t List -f FILE Name of TARFILE (- for stdin/out) -C DIR Change to DIR before operation -v Verbose -O Extract to stdout -o Dont restore user:group -k Dont replace existing files -Z (De)compress using compress -z (De)compress using gzip -J (De)compress using xz -j (De)compress using bzip2 --lzma (De)compress using lzma -a (De)compress based on extension -h Follow symlinks -T FILE File with names to include -X FILE File with glob patterns to exclude --exclude PATTERN Glob pattern to exclude --overwrite Replace existing files --strip-components NUM NUM of leading components to strip --no-recursion Dont descend in directories --numeric-owner Use numeric user:group --no-same-permissions Dont restore access permissions --to-command COMMAND Pipe files to COMMAND

taskset

taskset [-ap] [HEXMASK | -c LIST] { PID | PROG ARGS } Set or get CPU affinity -p Operate on PID -a Operate on all threads -c Affinity is a list, not mask

tc

tc OBJECT CMD [dev STRING] OBJECT: qdisc|class|filter CMD: add|del|change|replace|show qdisc [handle QHANDLE] [root|ingress|parent CLASSID] [[QDISC_KIND] [help|OPTIONS]] QDISC_KIND := [p|b]fifo|tbf|prio|cbq|red|etc. qdisc show [dev STRING] [ingress] class [classid CLASSID] [root|parent CLASSID] [[QDISC_KIND] [help|OPTIONS] ] class show [ dev STRING ] [root|parent CLASSID] filter [pref PRIO] [protocol PROTO] [root|classid CLASSID] [handle FILTERID] [[FILTER_TYPE] [help|OPTIONS]] filter show [dev STRING] [root|parent CLASSID]

tcpsvd

tcpsvd [-hEv] [-c N] [-C N[:MSG]] [-b N] [-u USER] [-l NAME] IP PORT PROG Create TCP socket, bind to IP:PORT and listen for incoming connections. Run PROG for each connection. IP PORT IP:PORT to listen on PROG ARGS Program to run -u USER[:GRP] Change to user/group after bind -c N Up to N connections simultaneously (default 30) -b N Allow backlog of approximately N TCP SYNs (default 20) -C N[:MSG] Allow only up to N connections from the same IP: new connections from this IP address are closed immediately, MSG is written to the peer before close -E Dont set up environment -h Look up peers hostname -l NAME Local hostname (else look up local hostname in DNS) -v Verbose Environment if no -E: PROTO='TCP' TCPREMOTEADDR='ip:port' ('[ip]:port' for IPv6) TCPLOCALADDR='ip:port' TCPORIGDSTADDR='ip:port' of destination before firewall Useful for REDIRECTed-to-local connections: iptables -t nat -A PREROUTING -p tcp --dport 80 -j REDIRECT --to 8080 TCPCONCURRENCY=num_of_connects_from_this_ip If -h: TCPLOCALHOST='hostname' (-l NAME is used if specified) TCPREMOTEHOST='hostname'

tee

tee [-ai] [FILE]... Copy stdin to each FILE, and also to stdout -a Append to the given FILEs, dont overwrite -i Ignore interrupt signals (SIGINT)

telnet

telnet [-a] [-l USER] HOST [PORT] Connect to telnet server -a Automatic login with $USER variable -l USER Automatic login as USER

telnetd

telnetd [OPTIONS] Handle incoming telnet connections -l LOGIN Exec LOGIN on connect -f ISSUE_FILE Display ISSUE_FILE instead of /etc/issue -K Close connection as soon as login exits (normally wait until all programs close slave pty) -p PORT Port to listen on -b ADDR[:PORT] Address to bind to -F Run in foreground -i Inetd mode

tftp

tftp [OPTIONS] HOST [PORT] Transfer a file from/to tftp server -l FILE Local FILE -r FILE Remote FILE -g Get file -p Put file -b SIZE Transfer blocks in bytes

tftpd

tftpd [-crl] [-u USER] [DIR] Transfer a file on tftp client's request tftpd is an inetd service, inetd.conf line: 69 dgram udp nowait root tftpd tftpd -l /files/to/serve Can be run from udpsvd: udpsvd -vE 0.0.0.0 69 tftpd /files/to/serve -r Prohibit upload -c Allow file creation via upload -u USER Access files as USER -l Log to syslog (inetd mode requires this)

time

time [-vpa] [-o FILE] PROG ARGS Run PROG, display resource usage when it exits -v Verbose -p POSIX output format -f FMT Custom format -o FILE Write result to FILE -a Append (else overwrite)

timeout

timeout [-s SIG] SECS PROG ARGS Run PROG. Send SIG to it if it is not gone in SECS seconds. Default SIG: TERM.

top

top [-bmH] [-n COUNT] [-d SECONDS] Show a view of process activity in real time. Read the status of all processes from /proc each SECONDS and show a screenful of them. Keys: N/M/P/T: show CPU usage, sort by pid/mem/cpu/time S: show memory R: reverse sort H: toggle threads, 1: toggle SMP Q,^C: exit Options: -b Batch mode -n N Exit after N iterations -d SEC Delay between updates -m Same as s key -H Show threads

touch

touch [-cham] [-d DATE] [-t DATE] [-r FILE] FILE... Update mtime of FILEs -c Dont create files -h Dont follow links -a Change only atime -m Change only mtime -d DT Date/time to use -t DT Date/time to use -r FILE Use FILEs date/time

tr

tr [-cds] STRING1 [STRING2] Translate, squeeze, or delete characters from stdin, writing to stdout -c Take complement of STRING1 -d Delete input characters coded STRING1 -s Squeeze multiple output characters of STRING2 into one character

traceroute

traceroute [-46Flnrv] [-f 1ST_TTL] [-m MAXTTL] [-q PROBES] [-p PORT] [-t TOS] [-w WAIT_SEC] [-s SRC_IP] [-i IFACE] [-z PAUSE_MSEC] HOST [BYTES] Trace the route to HOST -4,-6 Force IP or IPv6 name resolution -F Set dont fragment bit -l Display TTL value of the returned packet -n Print numeric addresses -r Bypass routing tables, send directly to HOST -f N First number of hops (default 1) -m N Max number of hops -q N Number of probes per hop (default 3) -p N Base UDP port number used in probes (default 33434) -s IP Source address -i IFACE Source interface -t N Type-of-service in probe packets (default 0) -w SEC Wait for a response (default 3) -z MSEC Wait before each send

traceroute6

traceroute6 [-nrv] [-f 1ST_TTL] [-m MAXTTL] [-q PROBES] [-p PORT] [-t TOS] [-w WAIT_SEC] [-s SRC_IP] [-i IFACE] [-z PAUSE_MSEC] HOST [BYTES] Trace the route to HOST -n Print numeric addresses -r Bypass routing tables, send directly to HOST -f N First number of hops (default 1) -m N Max number of hops -q N Number of probes per hop (default 3) -p N Base UDP port number used in probes (default 33434) -s IP Source address -i IFACE Source interface -t N Type-of-service in probe packets (default 0) -w SEC Wait for a response (default 3) -z MSEC Wait before each send

truncate

truncate [-c] -s SIZE FILE... Truncate FILEs to SIZE -c Do not create files -s SIZE

ts

ts [-is] [STRFTIME] Pipe stdin to stdout, add timestamp to each line -s Time since start -i Time since previous line

tty

tty [-s] Print file name of stdin's terminal -s Print nothing, only return exit status

ttysize

ttysize [w] [h] Print dimensions of stdin tty, or 80x24

tunctl

tunctl [-f DEVICE] [-t NAME | -d NAME] [-u USER] [-g GRP] [-b] Create or delete TUN/TAP interfaces -f DEV TUN device (default /dev/net/tun) -t NAME Create iface (default: tapN) -d NAME Delete iface -u USER Set iface owner -g GRP Set iface group -b Brief output

tune2fs

tune2fs [-c MAX_MOUNT_COUNT] [-i DAYS] [-C MOUNT_COUNT] [-L LABEL] BLOCKDEV Adjust filesystem options on ext[23] filesystems

ubiattach

ubiattach -m MTD_NUM [-d UBI_NUM] [-O VID_HDR_OFF] UBI_CTRL_DEV Attach MTD device to UBI -m MTD_NUM MTD device number to attach -d UBI_NUM UBI device number to assign -O VID_HDR_OFF VID header offset

ubidetach

ubidetach -d UBI_NUM UBI_CTRL_DEV Detach MTD device from UBI -d UBI_NUM UBI device number

ubimkvol

ubimkvol -N NAME [-s SIZE | -m] UBI_DEVICE Create UBI volume -a ALIGNMENT Volume alignment (default 1) -m Set volume size to maximum available -n VOLID Volume ID. If not specified, assigned automatically -N NAME Volume name -s SIZE Size in bytes -t TYPE Volume type (static|dynamic)

ubirename

ubirename UBI_DEVICE OLD_VOLNAME NEW_VOLNAME [OLD2 NEW2]... Rename UBI volumes on UBI_DEVICE

ubirmvol

ubirmvol -n VOLID | -N VOLNAME UBI_DEVICE Remove UBI volume -n VOLID Volume ID -N VOLNAME Volume name

ubirsvol

ubirsvol -n VOLID -s SIZE UBI_DEVICE Resize UBI volume -n VOLID Volume ID -s SIZE Size in bytes

ubiupdatevol

ubiupdatevol -t UBI_DEVICE | [-s SIZE] UBI_DEVICE IMG_FILE Update UBI volume -t Truncate to zero size -s SIZE Size in bytes to resize to

udhcpc

udhcpc [-fbqvRB] [-a[MSEC]] [-t N] [-T SEC] [-A SEC|-n] [-i IFACE] [-P PORT] [-s PROG] [-p PIDFILE] [-oC] [-r IP] [-V VENDOR] [-F NAME] [-x OPT:VAL]... [-O OPT]... -i IFACE Interface to use (default eth0) -P PORT Use PORT (default 68) -s PROG Run PROG at DHCP events (default /usr/share/udhcpc/default.script) -p FILE Create pidfile -B Request broadcast replies -t N Send up to N discover packets (default 3) -T SEC Pause between packets (default 3) -A SEC Wait if lease is not obtained (default 20) -b Background if lease is not obtained -n Exit if lease is not obtained -q Exit after obtaining lease -R Release IP on exit -f Run in foreground -S Log to syslog too -a[MSEC] Validate offered address with ARP ping -r IP Request this IP address -o Dont request any options (unless -O is given) -O OPT Request option OPT from server (cumulative) -x OPT:VAL Include option OPT in sent packets (cumulative) Examples of string, numeric, and hex byte opts: -x hostname:bbox - option 12 -x lease:3600 - option 51 (lease time) -x 0x3d:0100BEEFC0FFEE - option 61 (client id) -x 14:"dumpfile" - option 14 (shell-quoted) -F NAME Ask server to update DNS mapping for NAME -V VENDOR Vendor identifier (default udhcp VERSION) -C Dont send MAC as client identifier -v Verbose Signals: USR1 Renew lease USR2 Release lease

udhcpc6

udhcpc6 [-fbqvR] [-t N] [-T SEC] [-A SEC|-n] [-i IFACE] [-s PROG] [-p PIDFILE] [-P PORT] [-ldo] [-r IPv6] [-x OPT:VAL]... [-O OPT]... -i IFACE Interface to use (default eth0) -p FILE Create pidfile -s PROG Run PROG at DHCP events (default /usr/share/udhcpc/default.script) -B Request broadcast replies -t N Send up to N discover packets -T SEC Pause between packets (default 3) -A SEC Wait if lease is not obtained (default 20) -b Background if lease is not obtained -n Exit if lease is not obtained -q Exit after obtaining lease -R Release IP on exit -f Run in foreground -S Log to syslog too -P PORT Use PORT (default 546) -l Send information request instead of solicit (used for servers which do not assign IPv6 addresses) -r IPv6 Request this address (no to not request any IP) -d Request prefix -o Dont request any options (unless -O is given) -O OPT Request option OPT from server (cumulative) -x OPT:VAL Include option OPT in sent packets (cumulative) Examples of string, numeric, and hex byte opts: -x hostname:bbox - option 12 -x lease:3600 - option 51 (lease time) -x 0x3d:0100BEEFC0FFEE - option 61 (client id) -x 14:"dumpfile" - option 14 (shell-quoted) -v Verbose Signals: USR1 Renew lease USR2 Release lease

udhcpd

udhcpd [-fS] [-I ADDR] [-P PORT] [CONFFILE] DHCP server -f Run in foreground -S Log to syslog too -I ADDR Local address -a MSEC Timeout for ARP ping (default 2000) -P PORT Use PORT (default 67) Signals: USR1 Update lease file

udpsvd

udpsvd [-hEv] [-c N] [-u USER] [-l NAME] IP PORT PROG Create UDP socket, bind to IP:PORT and wait for incoming packets. Run PROG for each packet, redirecting all further packets with same peer ip:port to it. IP PORT IP:PORT to listen on PROG ARGS Program to run -u USER[:GRP] Change to user/group after bind -c N Up to N connections simultaneously (default 30) -E Dont set up environment -h Look up peers hostname -l NAME Local hostname (else look up local hostname in DNS) -v Verbose Environment if no -E: PROTO='UDP' UDPREMOTEADDR='ip:port' ('[ip]:port' for IPv6) UDPLOCALADDR='ip:port' If -h: UDPLOCALHOST='hostname' (-l NAME is used if specified) UDPREMOTEHOST='hostname'

uevent

uevent [PROG ARGS] uevent runs PROG for every netlink notification. PROG's environment contains data passed from the kernel. Typical usage (daemon for dynamic device node creation): # uevent mdev & mdev -s

umount

umount [-rlfda] [-t FSTYPE] FILESYSTEM|DIRECTORY Unmount filesystems -a Unmount all filesystems -r Remount devices read-only if mount is busy -l Lazy umount (detach filesystem) -f Force umount (i.e., unreachable NFS server) -d Free loop device if it has been used -t FSTYPE[,...] Unmount only these filesystem type(s)

uname

uname [-amnrspvio] Print system information -a Print all -m Machine (hardware) type -n Hostname -r Kernel release -s Kernel name (default) -p Processor type -v Kernel version -i Hardware platform -o OS name

uncompress

uncompress [-cf] [FILE]... Decompress FILEs (or stdin) -c Write to stdout -f Overwrite

unexpand

unexpand [-fa][-t N] [FILE]... Convert spaces to tabs, writing to stdout -a Convert all blanks -f Convert only leading blanks -t N Tabstops every N chars

uniq

uniq [-cduiz] [-f,s,w N] [FILE [OUTFILE]] Discard duplicate lines -c Prefix lines by the number of occurrences -d Only print duplicate lines -u Only print unique lines -i Ignore case -z NUL terminated output -f N Skip first N fields -s N Skip first N chars (after any skipped fields) -w N Compare N characters in line

unix2dos

unix2dos [-ud] [FILE] Convert FILE in-place from Unix to DOS format. When no file is given, use stdin/stdout. -u dos2unix -d unix2dos

unlink

unlink FILE Delete FILE by calling unlink()

unlzma

unlzma [-cfk] [FILE]... Decompress FILEs (or stdin) -c Write to stdout -f Force -k Keep input files -t Test integrity

unlzop

unlzop [-cfUvF] [FILE]... -c Write to stdout -f Force -U Delete input files -t Test integrity -v Verbose -F Dont verify checksum

unshare

unshare [OPTIONS] [PROG ARGS] -m,--mount[=FILE] Unshare mount namespace -u,--uts[=FILE] Unshare UTS namespace (hostname etc.) -i,--ipc[=FILE] Unshare System V IPC namespace -n,--net[=FILE] Unshare network namespace -p,--pid[=FILE] Unshare PID namespace -U,--user[=FILE] Unshare user namespace -f Fork before execing PROG -r Map current user to root (implies -U) --mount-proc[=DIR] Mount /proc filesystem first (implies -m) --propagation slave|shared|private|unchanged Modify mount propagation in mount namespace --setgroups allow|deny Control the setgroups syscall in user namespaces

unxz

unxz [-cfk] [FILE]... Decompress FILEs (or stdin) -c Write to stdout -f Force -k Keep input files -t Test integrity

unzip

unzip [-lnojpq] FILE[.zip] [FILE]... [-x FILE]... [-d DIR] Extract FILEs from ZIP archive -l List contents (with -q for short form) -n Never overwrite files (default: ask) -o Overwrite -j Do not restore paths -p Write to stdout -t Test -q Quiet -x FILE Exclude FILEs -d DIR Extract into DIR

uptime

uptime Display the time since the last boot

usleep

usleep N Pause for N microseconds

uudecode

uudecode [-o OUTFILE] [INFILE] Uudecode a file Finds OUTFILE in uuencoded source unless -o is given

uuencode

uuencode [-m] [FILE] STORED_FILENAME Uuencode FILE (or stdin) to stdout -m Use base64 encoding per RFC1521

vconfig

vconfig COMMAND [OPTIONS] Create and remove virtual ethernet devices add IFACE VLAN_ID rem VLAN_NAME set_flag IFACE 0|1 VLAN_QOS set_egress_map VLAN_NAME SKB_PRIO VLAN_QOS set_ingress_map VLAN_NAME SKB_PRIO VLAN_QOS set_name_type NAME_TYPE

  1. vi [-c CMD] [-R] [-H] [FILE]... Edit FILE -c CMD Initial command to run ($EXINIT also available) -R Read-only -H List available features

vlock

vlock [-a] Lock a virtual terminal. A password is required to unlock. -a Lock all VTs

volname

volname [DEVICE] Show CD volume name of the DEVICE (default /dev/cdrom)

watch

watch [-n SEC] [-t] PROG ARGS Run PROG periodically -n SEC Period (default 2) -t Dont print header

watchdog

watchdog [-t N[ms]] [-T N[ms]] [-F] DEV Periodically write to watchdog device DEV -T N Reboot after N seconds if not reset (default 60) -t N Reset every N seconds (default 30) -F Run in foreground Use 500ms to specify period in milliseconds

wc

wc [-cmlwL] [FILE]... Count lines, words, and bytes for FILEs (or stdin) -c Count bytes -m Count characters -l Count newlines -w Count words -L Print longest line length

wget

wget [-cqS] [--spider] [-O FILE] [-o LOGFILE] [--header 'HEADER: VALUE'] [-Y on/off] [-P DIR] [-U AGENT] [-T SEC] URL... Retrieve files via HTTP or FTP --spider Only check URL existence: $? is 0 if exists -c Continue retrieval of aborted transfer -q Quiet -P DIR Save to DIR (default .) -S Show server response -T SEC Network read timeout is SEC seconds -O FILE Save to FILE (- for stdout) -o LOGFILE Log messages to FILE -U STR Use STR for User-Agent header -Y on/off Use proxy

which

which COMMAND... Locate COMMAND

whoami

whoami Print the user name associated with the current effective user id

whois

whois [-i] [-h SERVER] [-p PORT] NAME... Query WHOIS info about NAME -i Show redirect results too -h,-p Server to query

xargs

xargs [OPTIONS] [PROG ARGS] Run PROG on every item given by stdin -0 Input is separated by NULs -a FILE Read from FILE instead of stdin -r Dont run command if input is empty -t Print the command on stderr before execution -p Ask user whether to run each command -E STR,-e[STR] STR stops input processing -I STR Replace STR within PROG ARGS with input line -n N Pass no more than N args to PROG -s N Pass command line of no more than N bytes -P N Run up to N PROGs in parallel -x Exit if size is exceeded

xxd

xxd [-pri] [-g N] [-c N] [-n LEN] [-s OFS] [-o OFS] [FILE] Hex dump FILE (or stdin) -g N Bytes per group -c N Bytes per line -p Show only hex bytes, assumes -c30 -i C include file style -l LENGTH Show only first LENGTH bytes -s OFFSET Skip OFFSET bytes -o OFFSET Add OFFSET to displayed offset -r Reverse (with -p, assumes no offsets in input)

xz

xz -d [-cfk] [FILE]... Decompress FILEs (or stdin) -d Decompress -c Write to stdout -f Force -k Keep input files -t Test integrity

xzcat

xzcat [FILE]... Decompress to stdout

yes

yes [STRING] Repeatedly print a line with STRING, or 'y'

zcat

zcat [FILE]... Decompress to stdout

zcip

zcip [OPTIONS] IFACE SCRIPT Manage a ZeroConf IPv4 link-local address -f Run in foreground -q Quit after obtaining address -r 169.254.x.x Request this address first -l x.x.0.0 Use this range instead of 169.254 -v Verbose $LOGGING=none Suppress logging $LOGGING=syslog Log to syslog With no -q, runs continuously monitoring for ARP conflicts, exits only on I/O errors (link down etc)

LIBC NSS

GNU Libc (glibc) uses the Name Service Switch (NSS) to configure the behavior of the C library for the local environment, and to configure how it reads system data, such as passwords and group information. This is implemented using an /etc/nsswitch.conf configuration file, and using one or more of the /lib/libnss_* libraries. BusyBox tries to avoid using any libc calls that make use of NSS. Some applets however, such as login and su, will use libc functions that require NSS.

If you enable CONFIG_USE_BB_PWD_GRP, BusyBox will use internal functions to directly access the /etc/passwd, /etc/group, and /etc/shadow files without using NSS. This may allow you to run your system without the need for installing any of the NSS configuration files and libraries.

When used with glibc, the BusyBox 'networking' applets will similarly require that you install at least some of the glibc NSS stuff (in particular, /etc/nsswitch.conf, /lib/libnss_dns*, /lib/libnss_files*, and /lib/libresolv*).

Shameless Plug: As an alternative, one could use a C library such as uClibc. In addition to making your system significantly smaller, uClibc does not require the use of any NSS support files or libraries.

MAINTAINER

Denis Vlasenko <vda.linux@googlemail.com>

AUTHORS

The following people have contributed code to BusyBox whether they know it or not. If you have written code included in BusyBox, you should probably be listed here so you can obtain your bit of eternal glory. If you should be listed here, or the description of what you have done needs more detail, or is incorrect, please send in an update.

Emanuele Aina <emanuele.aina@tiscali.it>

run-parts

Erik Andersen <andersen@codepoet.org>

Tons of new stuff, major rewrite of most of the core apps, tons of new apps as noted in header files. Lots of tedious effort writing these boring docs that nobody is going to actually read.

Laurence Anderson <l.d.anderson@warwick.ac.uk>

rpm2cpio, unzip, get_header_cpio, read_gz interface, rpm

Jeff Angielski <jeff@theptrgroup.com>

ftpput, ftpget

Edward Betts <edward@debian.org>

expr, hostid, logname, whoami

John Beppu <beppu@codepoet.org>

du, nslookup, sort

Brian Candler <B.Candler@pobox.com>

tiny-ls(ls)

Randolph Chung <tausq@debian.org>

fbset, ping, hostname

Dave Cinege <dcinege@psychosis.com>

more(v2), makedevs, dutmp, modularization, auto links file, various fixes, Linux Router Project maintenance

Jordan Crouse <jordan@cosmicpenguin.net>

ipcalc

Magnus Damm <damm@opensource.se>

tftp client insmod powerpc support

Larry Doolittle <ldoolitt@recycle.lbl.gov>

pristine source directory compilation, lots of patches and fixes.

Glenn Engel <glenne@engel.org>

httpd

Gennady Feldman <gfeldman@gena01.com>

Sysklogd (single threaded syslogd, IPC Circular buffer support, logread), various fixes.

Karl M. Hegbloom <karlheg@debian.org>

cp_mv.c, the test suite, various fixes to utility.c, &c.

Daniel Jacobowitz <dan@debian.org>

mktemp.c

Matt Kraai <kraai@alumni.cmu.edu>

documentation, bugfixes, test suite

Stephan Linz <linz@li-pro.net>

ipcalc, Red Hat equivalence

John Lombardo <john@deltanet.com>

tr

Glenn McGrath <bug1@iinet.net.au>

Common unarchiving code and unarchiving applets, ifupdown, ftpgetput, nameif, sed, patch, fold, install, uudecode. Various bugfixes, review and apply numerous patches.

Manuel Novoa III <mjn3@codepoet.org>

cat, head, mkfifo, mknod, rmdir, sleep, tee, tty, uniq, usleep, wc, yes, mesg, vconfig, make_directory, parse_mode, dirname, mode_string, get_last_path_component, simplify_path, and a number trivial libbb routines also bug fixes, partial rewrites, and size optimizations in ash, basename, cal, cmp, cp, df, du, echo, env, ln, logname, md5sum, mkdir, mv, realpath, rm, sort, tail, touch, uname, watch, arith, human_readable, interface, dutmp, ifconfig, route

Vladimir Oleynik <dzo@simtreas.ru>

cmdedit; xargs(current), httpd(current); ports: ash, crond, fdisk, inetd, stty, traceroute, top; locale, various fixes and irreconcilable critic of everything not perfect.

Bruce Perens <bruce@pixar.com>

Original author of BusyBox in 1995, 1996. Some of his code can still be found hiding here and there...

Tim Riker <Tim@Rikers.org>

bug fixes, member of fan club

Kent Robotti <robotti@metconnect.com>

reset, tons and tons of bug reports and patches.

Chip Rosenthal <chip@unicom.com>, <crosenth@covad.com>

wget - Contributed by permission of Covad Communications

Pavel Roskin <proski@gnu.org>

Lots of bugs fixes and patches.

Gyepi Sam <gyepi@praxis-sw.com>

Remote logging feature for syslogd

Linus Torvalds <torvalds@transmeta.com>

mkswap, fsck.minix, mkfs.minix

Mark Whitley <markw@codepoet.org>

grep, sed, cut, xargs(previous), style-guide, new-applet-HOWTO, bug fixes, etc.

Charles P. Wright <cpwright@villagenet.com>

gzip, mini-netcat(nc)

Enrique Zanardi <ezanardi@ull.es>

tarcat (since removed), loadkmap, various fixes, Debian maintenance

Tito Ragusa <farmatito@tiscali.it>

devfsd and size optimizations in strings, openvt and deallocvt.

Paul Fox <pgf@foxharp.boston.ma.us>

vi editing mode for ash, various other patches/fixes

Roberto A. Foglietta <me@roberto.foglietta.name>

port: dnsd

Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>

misc

Mike Frysinger <vapier@gentoo.org>

initial e2fsprogs, printenv, setarch, sum, misc

Jie Zhang <jie.zhang@analog.com>

fixed two bugs in msh and hush (exitcode of killed processes)

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