Manual: gnucksum

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 for the blake2 algorithm and must be a multiple of 8

       --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)

       sha224 (equivalent to sha224sum)

       sha256 (equivalent to sha256sum)

       sha384 (equivalent to sha384sum)

       sha512 (equivalent to sha512sum)

       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
       GNU coreutils online help: 
       Report any translation bugs to 

SEE ALSO
       Full documentation 
       or available locally via: info '(coreutils) cksum 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						    CKSUM(1)