music
OSdata.com: programming text book 

OSdata.com

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.

free book on Unix/Linux System Administration

Teach Yourself Unix/Linux System Administration and Shell Programming

free computer programming text book project

table of contents
If you like the idea of this project,
then please donate some money.
more information on donating

Google

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.


comments, suggestions, corrections, criticisms

please contact us

your name:
email address:
phone number:
message:

free music player coding example

    Coding example: I am making heavily documented and explained open source code for a method to play music for free — almost any song, no subscription fees, no download costs, no advertisements, all completely legal. This is done by building a front-end to YouTube (which checks the copyright permissions for you).

    View music player in action: www.musicinpublic.com/.

    Create your own copy from the original source code/ (presented for learning programming).

This section is under the category of owning cirticism.

In response to a posting about my article collecting social media, Moderator +Andrew Smith (Technology addict, Web Developer, API guru, futsal and football wannabe, and all round nice guy!, Swordfox Design, arrowtown, new zealand) of the Google+ community Web Developers, Web Designers, Web Coding claims “Quite frankly this is self promotion, and your site is not of great quality. I can see how +Joost Schuur  would think this of not high enough a standard.”


return to table of contents
free downloadable college text book
free downloadable system administrator and shell programming book

view text book
HTML file

Because I no longer have the computer and software to make PDFs, the book is available as an HTML file, which you can convert into a PDF.

previous page next page
previous page next page

free book on Unix/Linux System Administration

Teach Yourself Unix/Linux System Administration and Shell Programming

free computer programming text book project

Building a free downloadable text book on computer programming for university, college, community college, and high school classes in computer programming.

If you like the idea of this project,
then please donate some money.

send donations to:
Milo
PO Box 1361
Tustin, California 92781

Supporting the entire project:

    If you have a business or organization that can support the entire cost of this project, please contact Pr Ntr Kmt (my church)

more information on donating

Some or all of the material on this web page appears in the
free downloadable college text book on computer programming.


Google


Made with Macintosh

    This web site handcrafted on Macintosh computers using Tom Bender’s Tex-Edit Plus and served using FreeBSD .

Viewable With Any Browser


    †UNIX used as a generic term unless specifically used as a trademark (such as in the phrase “UNIX certified”). UNIX is a registered trademark in the United States and other countries, licensed exclusively through X/Open Company Ltd.

    Names and logos of various OSs are trademarks of their respective owners.

    Copyright © 2014 Milo

    Created: June 1, 2014

    Last Updated: June 1, 2014


return to table of contents
free downloadable college text book
free downloadable system administrator and shell programming book

previous page next page
previous page next page