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You are here: manpages

B2SUM

Section: User Commands (1)
Updated: September 2017
Index Return to Main Contents

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: <http://www.gnu.org/software/coreutils/>
Report b2sum translation bugs to <http://translationproject.org/team/>

COPYRIGHT

Copyright © 2017 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://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.