


      SUM(1)                      (UNIX 5.0)                     SUM(1)



      NAME
           sum - print checksum and block count of a file

      SYNTAX
           sum [ -r ] 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.  The option
           -r causes an alternate algorithm to be used in computing the
           checksum.

           Block counts are calculated by: Int(((file
           size(bytes)+4095)/4096)*4.  The block count equation
           evaluates to a 1024-byte increment.

      SEE ALSO
           wc(1).

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































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