# cksum(n) 1.0 crc "cksum"

## NAME

cksum - calculate a cksum(1) compatible checksum

## SYNOPSIS

package require Tcl 8.2
package require cksum ?1.0?

::crc::cksum ?-format format? message
::crc::cksum ?-format format? -filename file

## DESCRIPTION

This package provides a Tcl-only implementation of the cksum(1) algorithm based upon information provided at in the GNU implementation of this program as part of the GNU Textutils 2.0 package.

## COMMANDS

::crc::cksum ?-format format? message
::crc::cksum ?-format format? -filename file
  The command takes string data or a file name and returns a checksum value calculated using the cksum(1) algorithm. The result is formatted using the format(n) specifier provided or as an unsigned integer (%u) by default.

## OPTIONS

-filename name
  Return a checksum for the file contents instead of for parameter data.
-format string
  Return the checksum using an alternative format template.

## EXAMPLES

    % crc::cksum "Hello, World!"
    2609532967

    % crc::cksum -format 0x%X "Hello, World!"
    0x9B8A5027

    % crc::cksum -file cksum.tcl
    1828321145

## SEE ALSO

sum(n), crc32(n)

## AUTHORS

Pat Thoyts

## KEYWORDS

cksum, checksum, crc, crc32, cyclic redundancy check, data integrity, security