compute and check BLAKE2 message digest


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] | b2sum


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


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)

-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.


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


Copyright 2019 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.


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


Written by Padraig Brady and Samuel Neves.

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