sha1sum
compute and check SHA1 message digest
TLDR
Calculate the SHA1 checksum for a file
Calculate SHA1 checksums for multiple files
Read a file of SHA1 sums and verify all files have matching checksums
SYNOPSIS
sha1sum [ OPTION ]...[ FILE ]...
DESCRIPTION
Print or check SHA1 (160 -bit) checksums.
With no FILE, or when FILE is -, read standard input.
-b , --binary read in binary mode
-c , --check read SHA1 sums from the FILEs and check them
--tag create a BSD -style checksum
-t , --text read in text mode (default)
-z , --zero end each output line with NUL, not newline, and disable file name escaping
The following five options are useful only when verifying checksums:
--ignore -missing don't fail or report status for missing files
--quiet don't print OK for each successfully verified file
--status don't output anything, status code shows success
--strict exit non -zero for improperly formatted checksum lines
-w , --warn warn about improperly formatted checksum lines
--help display this help and exit
--version output version information and exit
The sums are computed as described in FIPS -180 -1. When checking, the input should be a former output of this program. The default mode is to print a line with checksum, a space, a character indicating input mode ('*' for binary, ' ' for text or where binary is insignificant), and name for each FILE.
BUGS
Do not use the SHA-1 algorithm for security related purposes. Instead, use an SHA -2 algorithm, implemented in the programs sha224sum(1), sha256sum(1), sha384sum(1), sha512sum(1), or the BLAKE2 algorithm, implemented in b2sum(1)
REPORTING BUGS
GNU coreutils online help: <https://www.gnu.org/software/coreutils/>
Report any translation bugs to <https://translationproject.org/team/>
COPYRIGHT
Copyright 2019 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <https://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.
SEE ALSO
Full documentation <https://www.gnu.org/software/coreutils/sha1sum> or available locally via: info sha1sum invocation
AUTHOR
Written by Ulrich Drepper, Scott Miller, and David Madore.