b2sum man page

b2sum — compute and check BLAKE2 message digest


b2sum filename1

b2sum filename1 filename2

b2sum -c filename.b2

somecommand | shasum


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


create a BSD-style checksum

-t, --text

read in text mode (default)

Note: There is no difference between binary and text mode option on GNU system. -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


don't fail or report status for missing files


don't print OK for each successfully verified file


don't output anything, status code shows success


exit non-zero for improperly formatted checksum lines

-w, --warn

warn about improperly formatted checksum lines


display this help and exit


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.


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'

Referenced By

md5sum(1), sha1sum(1).

July 2018 GNU coreutils 8.30 User Commands