Linux Command Library
commands
Commands
basic
Basic
tips
Tips

who

show who is logged on

- Display the username, line, and time of all currently logged-in sessions:
who

- Display information only for the current terminal session:
who am i

- Display all available information:
who -a

- Display all available information with table headers:
who -a -H

who [,OPTION/]... [ ,FILE | ARG1 ARG2 /]

Print information about users who are currently logged in.

-a, --all
same as -b -d --login -p -r -t -T -u
-b, --boot
time of last system boot
-d, --dead
print dead processes
-H, --heading
print line of column headings
--ips
print ips instead of hostnames. with --lookup, canonicalizes based on stored IP, if available, rather than stored hostname
-l, --login
print system login processes
--lookup
attempt to canonicalize hostnames via DNS
-m
only hostname and user associated with stdin
-p, --process
print active processes spawned by init
-q, --count
all login names and number of users logged on
-r, --runlevel
print current runlevel
-s, --short
print only name, line, and time (default)
-t, --time
print last system clock change
-T, -w, --mesg
add user's message status as +, - or ?
-u, --users
list users logged in
--message
same as -T
--writable
same as -T
--help
display this help and exit
--version
output version information and exit

If FILE is not specified, use ,/var/run/utmp/. ,/var/log/wtmp/ as FILE is common. If ARG1 ARG2 given, -m presumed: 'am i' or 'mom likes' are usual.

Written by Joseph Arceneaux, David MacKenzie, and Michael Stone.

GNU coreutils online help: <http://www.gnu.org/software/coreutils/> Report who translation bugs to <http://translationproject.org/team/>

Copyright © 2016 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.

Full documentation at: <http://www.gnu.org/software/coreutils/who> or available locally via: info '(coreutils) who invocation'

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