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Name

::crc::sum - calculate a sum(1) compatible checksum

Synopsis

package require Tcl 8.2

package require sum ?1.0?

::crc::sum ?-format string? -file filename | string _________________________________________________________________

Description

This package provides a Tcl-only implementation of the sum(1) command which calculates a 16 bit checksum value from the input data. The BSD sum algorithm is used by default but the SysV algorithm is also available.

Commands

::crc::sum ?-format string? -file filename | string The command takes string data or a file name and returns a checksum value calculated using the sum(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::sum «Hello, World!"
37287

% crc::sum -format 0x%X «Hello, World!" 0x91A7

% crc::sum -file cksum.tcl
13392

See Also

sum(1) , cksum(n) , crc32(n)

Authors

Pat Thoyts

Keywords

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

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