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b2sum

b2sum --version (return code: 0)

b2sum (GNU coreutils) 8.26
Copyright (C) 2016 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.

Written by Padraig Brady and Samuel Neves.
b2sum --help (return code: 0)

Usage: 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)

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