# info > b2sum

## File: coreutils.info,  Node: b2sum invocation,  Next: sha1sum invocation,  Prev: md5sum invocation,  Up: Summarizing files

### 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 *note cksum output modes::.

   The program accepts *note cksum common options::.  Also see *note
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.