coreutils: b2sum invocation

1 
1 6.4 ‘b2sum’: Print or check BLAKE2 digests
1 ==========================================
1 
1 ‘b2sum’ computes a 512-bit checksum for each specified FILE.  The same
11 usage and options as the ‘md5sum’ command are supported.  ⇒md5sum
 invocation.  In addition ‘b2sum’ supports the following options.
1 
1 ‘-l’
1 ‘--length’
1      Change (shorten) the default digest length.  This is specified in
1      bits and thus must be a multiple of 8.  This option is ignored when
1      ‘--check’ is specified, as the length is automatically determined
1      when checking.
1