


      SSSSUUUUMMMM((((1111))))                      ((((UUUUNNNNIIIIXXXX 5555....0000))))                     SSSSUUUUMMMM((((1111))))



      NNNNAAAAMMMMEEEE
           sum - print checksum and block count of a file

      SSSSYYYYNNNNTTTTAAAAXXXX
           ssssuuuummmm [ ----rrrr ] file

      DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
           _S_u_m 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
           ----rrrr 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.

      SSSSEEEEEEEE AAAALLLLSSSSOOOO
           wc(1).

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































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