| SHA1SUM(1) | User Commands | SHA1SUM(1) |
NAME
sha1sum - compute and check SHA1 message digest
SYNOPSIS
sha1sum [OPTION]... [FILE]...
DESCRIPTION
Print or check SHA1 checksums. Legacy interface to the cksum(1) utility.
With no FILE, or when FILE is -, read standard input.
Mandatory arguments to long options are mandatory for short options too.
- -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
When checking, the input should be a former output of this program, or equivalent standalone program.
BUGS
Do not use the MD5 algorithm for security related purposes. Instead, use an SHA-2, SHA-3, or BLAKE2 algorithm, implemented in the cksum(1) program.
AUTHOR
Written by Padraig Brady and Q. Frank Xia.
REPORTING BUGS
Report bugs to: <bug-coreutils@gnu.org>.
Report any translation bugs to: <https://translationproject.org/team/>.
GNU coreutils home page: <https://www.gnu.org/software/coreutils/>
General help using GNU software: <https://www.gnu.org/gethelp/>
COPYRIGHT
Copyright © 2026 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
Full documentation
<https://www.gnu.org/software/coreutils/sha1sum>
or available locally via: info '(coreutils) sha1sum invocation'
| October 2026 | GNU coreutils 9.12 |