SUM(1)									SUM(1)

NAME    [Toc]    [Back]

     sum - print checksum and block count of a file

SYNOPSIS    [Toc]    [Back]

     sum [ -r ]	file

DESCRIPTION    [Toc]    [Back]

     sum calculates and	prints a 16-bit	checksum for the named file, and also
     prints the	number of blocks in the	file.  NULL characters (with ASCII
     value zero) are ignored in	computing the checksum.	 sum 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.  This alternate algorithm does not	ignore
     NULL characters.

SEE ALSO    [Toc]    [Back]

     wc(1).

DIAGNOSTICS    [Toc]    [Back]

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


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