- Calculate the SHA1 checksum for a file:sha1sum [filename1]- Calculate SHA1 checksums for multiple files:sha1sum [filename1] [filename2]- Read a file of SHA1 sums and verify all files have matching checksums:sha1sum -c [filename.sha1]
sha1sum [,OPTION/]... [,FILE/]...
Print or check SHA1 (160-bit) checksums.
With no FILE, or when FILE is -, read standard input.
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.
Written by Ulrich Drepper, Scott Miller, and David Madore.
GNU coreutils online help: <http://www.gnu.org/software/coreutils/> Report sha1sum 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/sha1sum> or available locally via: info '(coreutils) sha1sum invocation'