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 for the named
          file, and also prints the number of blocks in the file.  It
          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 indistinuishable from end of file on most
          devices; check the block count.