Manual: gnusha1sum

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 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 pro‐
       gram.  The default mode is to print a line with: checksum, a space, a character indicating input mode  ('*'  for	 bi‐
       nary, ' ' 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: 
       Report any translation bugs to 

SEE ALSO
       cksum(1)

       Full documentation 
       or available locally via: info '(coreutils) sha1sum invocation'

       Packaged by Ubuntu (9.7-3ubuntu2)
       Copyright © 2025 Free Software Foundation, Inc.
       License GPLv3+: GNU GPL version 3 or later .
       This is free software: you are free to change and redistribute it.
       There is NO WARRANTY, to the extent permitted by law.

GNU coreutils 9.7					January 2026						  SHA1SUM(1)