Usage: /usr/bin/b2sum [OPTION]... [FILE]...
Print or check BLAKE2b (512-bit) checksums.
Legacy interface to the cksum(1) utility.

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 size
         and must be a multiple of 8 for blake2b;
         must be 224, 256, 384, or 512 for sha2 or sha3
      --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.

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

Report bugs to: <bug-coreutils@gnu.org>.
GNU coreutils home page: <https://www.gnu.org/software/coreutils/>
General help using GNU software: <https://www.gnu.org/gethelp/>
Full documentation <https://www.gnu.org/software/coreutils/b2sum>
or available locally via: info '(coreutils) b2sum invocation'