SHA1SUM(1) User Commands SHA1SUM(1)
sha1sum - compute and check SHA1 message digest
sha1sum [OPTION]... [FILE]...
Print or check SHA1 (160-bit) checksums. With no FILE, or when FILE is -, read standard input.
read in binary mode
read SHA1 sums from the FILEs and check them
--tag create a BSD-style checksum
read in text mode (default)
Note: There is no difference between binary and text mode option on GNU system.
The following four options are useful only when verifying checksums:
don't print OK for each successfully verified file
don't output anything, status code shows success
exit non-zero for improperly formatted checksum lines
warn about improperly formatted checksum lines
--help display this help and exit
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 character indicating input mode ('*' for binary, space for text), and name for each FILE.
GNU coreutils online help: <http://www.gnu.org/software/coreutils/> Report sha1sum translation bugs to <http://translationpro-
Written by Ulrich Drepper, Scott Miller, and David Madore.
Copyright (C) 2013 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.
The full documentation for sha1sum is maintained as a Texinfo manual. If the info and sha1sum programs are properly installed at your
site, the command
info coreutils 'sha1sum invocation'
should give you access to the complete manual.
GNU coreutils 8.22 June 2014 SHA1SUM(1)