data integrity check needed

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sum

sum(1)							      General Commands Manual							    sum(1)

NAME

       sum - print checksum and block or byte count of file(s)

SYNOPSIS

       [file ...]

   Remarks
       is obsolescent and should not be used in new applications that are intended to be portable between systems.  Use instead (see cksum(1)).

DESCRIPTION

       calculates  and	prints to standard output a checksum for each named file, and also prints the size of the file in 512 byte blocks, rounded
       up.

       The default algorithm is a 16-bit sum of the bytes in which overflow is ignored.   Alternate  algorithms  can  be  selected  with  the  and
       options.

       Standard input is used if no file names are given.

       is typically used to verify data integrity when copying files between systems.

   Options
       recognizes the following options:

	      Use an alternate algorithm in which the 16-bit sum is right rotated
			with each byte in computing the checksum.

	      Use the 32-bit cyclical redundancy check (CRC) algorithm used by

RETURN VALUE

       returns the following values upon completion:

	      All files were processed successfully.

	      One or more files could not be read or some other error occurred.

       If an inaccessible file is encountered, continues processing any remaining files, but the final exit status is affected.

DIAGNOSTICS

       Read error conditions are indistinguishable from end of file on most devices; check the block or byte count.

WARNINGS

       This  command  is  likely  to  be withdrawn from X/Open standards.  Applications using this command might not be portable to other vendors'
       platforms. The usage of cksum(1) is recommended.

SEE ALSO

       cksum(1), wc(1).

STANDARDS CONFORMANCE

																	    sum(1)

Shell Programming and Scripting