A Tcl implementation of the `cksum(1)` command is now part of [Tcllib]. [http://core.tcl.tk/tcllib/doc/trunk/embedded/www/tcllib/files/modules/crc/cksum.html%|%Documentation link]

The `cksum(1)` command calculates a 32 bit checksum of the input data using a POSIX standard algorithm and so should give the same result across multiple platforms (unlike the [sum] command). The Tcllib version uses the same algorithm and has been checked against the GNU and BSD `cksum(1)` commands.

More information about the unix command can be found at http://www.tac.eu.org/cgi-bin/man-cgi?cksum+1 or by referring to your system manual page.

For example:
======
% package require cksum
1.0
% crc::cksum "Hello, World!"
2609532967
% crc::cksum -file cksum.tcl
871033703
% exec cksum cksum.tcl
871033703 6652 cksum.tcl
%
======
----
See the code at [http://core.tcl.tk/tcllib/artifact/ec8b67db9dd09e9878f8937033bc09c5666019d5%|%http://core.tcl.tk/tcllib/modules/crc/cksum.tcl]

----
**See also**
   * [crc]
   * [sum]
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