A Tcl implementation of the cksum(1) command is now part of [Tcllib] and should end up in Tcllib 1.2. [PT]

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
  %

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See the code at http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/tcllib/tcllib/modules/crc/cksum.tcl?rev=HEAD&content-type=text/vnd.viewcvs-markup

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[Category Package] subset [Tcllib] see also [crc] and [sum]