SUM(1)                                                     SUM(1)

     NAME
          sum - sum and count blocks in a file

     SYNOPSIS
          sum [ file ] ...

     DESCRIPTION
          Sum calculates and prints a 16-bit checksum along with the
          length (in blocks) and name of each file. If no files are
          given, the standard input is summed.  If file is `-', file
          names are read from standard input.

          Sum is typically used to look for bad spots, or to validate
          a file communicated over some transmission line.

     SEE ALSO
          wc(1).

     DIAGNOSTICS
          `Read error' is indistinguishable from end of file on most
          devices; check the byte count.