I have written an excellent(at least in my highly unbiased opinion) Tcl Tk Tutorial for Tcl/Tk - if you are beginner to this language, I would highly recommend this tutorial.
Tcl stands for Tool Command Language. Tcl and Tk, its associated graphical user interface toolkit, was created by Professor John Ousterhout of the University of California, Berkeley.
Tcl is a very simple, open-source-licensed programming language. Tcl provides basic language features such as variables, procedures, and control, and it runs on almost any modern OS, such as Unix, Macintosh, and Windows 95/98/NT/XP computers.
Tcl was originally developed as a reusable command language for experimental computer aided design(CAD) tools. The interpreter was implemented as a C library that could be linked into any application. It is very easy to add new functions to the Tcl interpreter, so it is an ideal reusable "macro language" that can be integrated into many applications.
But Tcl is a programming language in its own right, which can be roughly described as a cross-breed between LISP/Scheme (with less parens) and shells (with more powerful structuring). You can write any number of programs in Tcl, just as you can in any other language. Tcl programs are usually called "scripts" because the programs do not need to be compiled into a machine-readable form.
Enough history(..yarn..). Now lets move on to the tutorial. Click here for the contents - or skip straight to the important parts.
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