b2sum - Man Page

compute and check BLAKE2 message digest

Examples (TL;DR)

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 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

cksum(1)

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

Referenced By

md5sum(1), sha1sum(1).

October 2021 GNU coreutils 9.0