SUM(C)                                     UNIX System V



     Name
          sum - calculates checksum and counts blocks in 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 512-byte blocks in the
          file.  It is typically used to look for  bad  spots,  or  to
          validate  a file communicated over a transmission line.  The
          option -r causes  an  alternate  algorithm  to  be  used  in
          computing the checksum.


     See Also
          cmchk(C), machine(HW), wc(C)


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


     Standards Conformance
          sum is conformant with:

          AT&T SVID Issue 2, Select Code 307-127;
          and The X/Open Portability Guide II of January 1987.


     (printed 8/24/89)                                  SUM(C)