Man1 - sha1sum.1
Table of Contents
NAME
sha1sum - compute and check SHA1 message digest
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 checksums 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.
Note: There is no difference between binary mode and text mode on GNU systems.
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)
AUTHOR
Written by Ulrich Drepper, Scott Miller, and David Madore.
REPORTING BUGS
GNU coreutils online help: https://www.gnu.org/software/coreutils/
Report any translation bugs to https://translationproject.org/team/
COPYRIGHT
Copyright © 2021 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
cksum(1)
Full documentation https://www.gnu.org/software/coreutils/sha1sum
or available locally via: info ’(coreutils) sha1sum invocation’