b2sum — compute and check BLAKE2 message digest

Examples (TL;DR)

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)

-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.

Note: There is no difference between binary mode and text mode on GNU systems.

Author

Written by Padraig Brady and Samuel Neves.

Reporting Bugs

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

See Also

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

Referenced By

md5sum(1), sha1sum(1).

October 2019 GNU coreutils 8.31