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 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.

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 Gentoo bugs to: <https://bugs.gentoo.org/>
Report any translation bugs to <https://translationproject.org/team/>

SEE ALSO
cksum(1)

Full documentation <https://www.gnu.org/software/coreutils/sha1sum>
or available locally via: info '(coreutils) sha1sum invocation'

Packaged by Gentoo (9.7 (p0))
Copyright © 2025 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.