Tcl/Tk programming
Tcl (originally from "Tool Command Language", but nonetheless conventionally rendered as "Tcl" rather than "TCL"; and pronounced like "tickle") is a scripting language created by John Ousterhout that is generally thought to be easy to learn, but powerful in the right hands. It is most commonly used for rapid prototyping, scripted applications, GUIs and testing.
2.1 Very simple and consistent syntax
2.2 Symbols with a special meaning
2.3 Some examples of commands
2.4 Procedures
2.5 Associative arrays
4.1 Echo server
4.2 Digital clock
4.3 List of content of associative array
4.4 Intersection of two sets
The article above is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Tool Command Language".