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Tool command language (Tcl) is a powerful scripting language with programming features. It is available across Unix, Windows and Mac OS platforms. Tcl is used for Web and desktop applications, networking, administration, testing, rapid prototyping, scripted applications and graphical user interfaces (GUI).
Introduced in 1988 by John Ousterhout, Tcl is used for common gateway interface (CGI) scripting and serves as the Eggdrop bot scripting language. Tcl/Tk refers to a combination of Tcl and the Tk GUI toolkit.
Tcl features include: