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B2SUM(1)			  User Commands 			B2SUM(1)

NAME
     b2sum - compute and check BLAKE2 message digest

SYNOPSIS
     b2sum [OPTION]... [FILE]...

DESCRIPTION
     Print or check BLAKE2b (512-bit) checksums.

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

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

     -b, --binary
	    read in binary mode

     -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

     --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 RFC 7693.	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.

AUTHOR
     Written by Padraig Brady and Samuel Neves.

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
     cksum(1)

     Full documentation <https://www.gnu.org/software/coreutils/b2sum>
     or available locally via: info '(coreutils) b2sum invocation'

GNU coreutils 9.9		  November 2025 			B2SUM(1)

Want to link to this manual page? Use this URL:
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