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.  Legacy interface to the cksum
     utility.

     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 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 Ulrich Drepper, Scott Miller, and David Madore.

REPORTING BUGS
     Report bugs to: bug-coreutils@gnu.org
     GNU coreutils home page: <https://www.gnu.org/software/coreutils/>
     General help using GNU software: <https://www.gnu.org/gethelp/>
     Report any translation bugs to <https://translationproject.org/team/>

COPYRIGHT
     Copyright	(C) 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
     cksum(1)

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

GNU coreutils 9.11		   April 2026			      SHA1SUM(1)