sha1sum - compute and check SHA1 message digest
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)
--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 character indicating input mode ('*' for binary, space for text), 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 © 2014 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 (aq(coreutils) sha1sum invocation(aq