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ActiveTcl User Guide
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sum(n) 1.0 crc "sum"
NAME
sum - calculate a sum(1) compatible checksum
SYNOPSIS
package require Tcl 8.2
package require sum ?1.0?
::crc::sum ?-format format? message |
::crc::sum ?-format format? -filename file |
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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 format? message
- ::crc::sum ?-format format? -filename file
- 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
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% crc::sum "Hello, World!"
37287
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% crc::sum -format 0x%X "Hello, World!"
0x91A7
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% crc::sum -file sum.tcl
13392
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SEE ALSO
sum(1), cksum(n), crc32(n)
AUTHORS
Pat Thoyts
KEYWORDS
sum, cksum, checksum, crc, crc32, cyclic redundancy check, data
integrity, security