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CKSUM(1)			 User Commands			      CKSUM(1)

NAME
       cksum - compute and verify file checksums

SYNOPSIS
       cksum [OPTION]... [FILE]...

DESCRIPTION
       Print or	verify checksums.  By default use the 32 bit CRC algorithm.

       With no FILE, or	when FILE is -,	read standard input.

       Mandatory  arguments  to	 long  options are mandatory for short options
       too.

       -a, --algorithm=TYPE
	      select the digest	type to	use.  See DIGEST below

       --base64
	      emit base64-encoded digests, not hexadecimal

       -c, --check
	      read checksums from the FILEs and	check them

       -l, --length=BITS
	      digest length in bits; must not exceed the max size and must  be
	      a	 multiple  of 8	for blake2b; must be 224, 256, 384, or 512 for
	      sha2 or sha3

       --raw  emit a raw binary	digest,	not hexadecimal

       --tag  create a BSD-style checksum (the default)

       --untagged
	      create a reversed	style checksum,	without	digest type

       -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

       --debug
	      indicate which implementation used

       --help display this help	and exit

       --version
	      output version information and exit

   DIGEST determines the digest	algorithm and default output format:
       sysv   (equivalent to sum -s)

       bsd    (equivalent to sum -r)

       crc    (equivalent to cksum)

       crc32b (only available through cksum)

       md5    (equivalent to md5sum)

       sha1   (equivalent to sha1sum)

       sha2   (equivalent to sha{224,256,384,512}sum)

       sha3   (only available through cksum)

       blake2b
	      (equivalent to b2sum)

       sm3    (only available through cksum)

       When  checking, the input should	be a former output of this program, or
       equivalent standalone program.

AUTHOR
       Written by Padraig Brady	and Q. Frank Xia.

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) 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.

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

GNU coreutils 9.9		 November 2025			      CKSUM(1)

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