SHA1SUMSection: User Commands (1)
Updated: January 2018
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NAMEsha1sum - compute and check SHA1 message digest
SYNOPSISsha1sum [,OPTION/]... [,FILE/]...
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
- create a BSD-style checksum
- -t, --text
- read in text mode (default)
The following five options are useful only when verifying checksums:
- don't fail or report status for missing files
- 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
- -w, --warn
- warn about improperly formatted checksum lines
- 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 space, a character indicating input mode ('*' for binary, ' ' for text or where binary is insignificant), and name for each FILE.
BUGSDo 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)
AUTHORWritten by Ulrich Drepper, Scott Miller, and David Madore.
REPORTING BUGSGNU coreutils online help: <http://www.gnu.org/software/coreutils/>
Report sha1sum translation bugs to <http://translationproject.org/team/>
COPYRIGHTCopyright © 2017 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.
SEE ALSOFull documentation at: <http://www.gnu.org/software/coreutils/sha1sum>
or available locally via: info '(coreutils) sha1sum invocation'
- REPORTING BUGS
- SEE ALSO
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