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Tcl

summary

����This subchapter looks at tcl, a Unix (and Linux) command, including both running shell scripts from a web browser and running Tcl from the shell.

����tcl is used to run a CLI version of Tcl.

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Tcl

����This subchapter looks at tcl, a Unix (and Linux) command, including both running shell scripts from a web browser and running Tcl from the shell.

����tcl is used to run a CLI version of Tcl.

getting started

����Use which to determine the location of your local copy of Tcl (and to make sure you actually have a copy):

����$ which tclsh
����/usr/bin/tclsh
����$

����This example assumes that you have created the scripts directory in your home directory.

����Create a tcl script called script.tcl and save it in the new scripts directory (folder):

����#!/usr/bin/tclsh
����puts "Hello World!"

����Run your new script by running the tclsh program with your script as the file to execute:

����$ tclsh ~/scripts/script.tcl
����Hello World!
����$

text-based interactive version

����To run a text-only version of tclsh, simply type tclsh (and return) from the BASH command line and you should get a percent sign (%) prompt. This means you have sccessfully entered tclsh.

����$ tclsh
����%

����Now that you are in tclsh, type info tclversion to see which version.

����% info tclversion
����8.5
����%

����And to see Tcl make use of a simple BASH command, type ls -l:

����% ls -l
����a regular listing of files
����%

����And to return back to BASH, type exit:

����% exit
����$

visual interactive version

����Now test out the visual version by typing wish (assuming it is installed and you have X-Windows running).

����$ wish
����%

����The contents of your Terminal window will not change from the text-only version, but you will get an additional display window that is controlled from the command line.

����And return to BASH:

����% exit
����$

brief history

����Tcl was created in the late 1980s by Dr. John Osterhout. Tcl stands for Tool Command Language.

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