sha1sum(1) - man - phpman

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⚡ TLDR: sha1sum (tldr-pages)

Calculate SHA1 cryptographic checksums.

Calculate the SHA1 checksum for one or more files
sha1sum {{path/to/file1 path/to/file2 ...}}
Calculate and save the list of SHA1 checksums to a file
sha1sum {{path/to/file1 path/to/file2 ...}} > {{path/to/file.sha1}}
Calculate a SHA1 checksum from `stdin`
{{command}} | sha1sum
Read a file of SHA1 checksums and filenames and verify all files have matching checksums
sha1sum {{-c|--check}} {{path/to/file.sha1}}
Only show a message for missing files or when verification fails
sha1sum {{-c|--check}} --quiet {{path/to/file.sha1}}
Only show a message when verification fails, ignoring missing files
sha1sum --ignore-missing {{-c|--check}} --quiet {{path/to/file.sha1}}
Check a known SHA1 checksum of a file
echo {{known_sha1_checksum_of_the_file}} {{path/to/file}} | sha1sum {{-c|--check}}

SHA1SUM(1) User Commands SHA1SUM(1)

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 SHA1 sums 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 for‐
mer 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 insignifi‐
cant), 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 algo‐
rithm, 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 © 2020 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'

GNU coreutils 8.32 January 2026 SHA1SUM(1)