b2sum (1)

Quick Reference

Calculate BLAKE2 cryptographic checksums.

  • Calculate the BLAKE2 checksum for a file:

b2sum {{filename1}}

  • Calculate BLAKE2 checksums for multiple files:

b2sum {{filename1}} {{filename2}}

  • Read a file of BLAKE2 sums and filenames and verify all files have matching checksums:

b2sum -c {{filename.b2}}

  • Calculate the BLAKE2 checksum from stdin:

{{somecommand}} | shasum

NAME

b2sum - compute and check BLAKE2 message digest

SYNOPSIS

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

DESCRIPTION

Print or check BLAKE2 (512-bit) checksums.
With no FILE, or when FILE is -, read standard input.
-b, --binary
read in binary mode
-c, --check
read BLAKE2 sums from the FILEs and check them
-l, --length
digest length in bits; must not exceed the maximum for the blake2 algorithm and must be a multiple of 8
--tag
create a BSD-style checksum
-t, --text
read in text mode (default)

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.

AUTHOR

Written by Padraig Brady and Samuel Neves.

REPORTING BUGS

GNU coreutils online help: <https://www.gnu.org/software/coreutils/>
 
Report b2sum translation bugs to <https://translationproject.org/team/>

SEE ALSO

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

Information

Source
Coreutils
OS/version
GNU coreutils 8.29.13-0a854
Source updated
December 2, 2018
Page created
February 9, 2018
Page generated
December 2, 2018