coreutils: b2sum invocation

 
 6.5 ‘b2sum’: Print or check BLAKE2 digests
 ==========================================
 
 ‘b2sum’ computes a 512-bit checksum for each specified FILE.
 
    If a FILE is specified as ‘-’ or if no files are given ‘b2sum’
 computes the checksum for the standard input.  ‘b2sum’ can also
 determine whether a file and checksum are consistent.  Synopsis:
 
      b2sum [OPTION]... [FILE]...
 
    ‘b2sum’ uses the ‘Untagged output format’ for each specified file, as
 described at ⇒cksum output modes.
 
DONTPRINTYET     The program accepts ⇒cksum common options.  Also see *noteDONTPRINTYET     The program accepts ⇒cksum common options.  Also see ⇒
 Common options.
 
    In addition ‘b2sum’ supports the following options.
 
 ‘-l’
 ‘--length’
      Change (shorten) the default digest length.  This is specified in
      bits and thus must be a multiple of 8.  This option is ignored when
      ‘--check’ is specified, as the length is automatically determined
      when checking.