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Category:Tcl: Difference between revisions
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{{Codepad}}
'''Tcl''' (short for '''T'''ool '''C'''ommand '''L'''anguage)
is a scripting language with very simple syntax, dynamic typing,
automatic storage allocation and [[garbage collection]]
and native Unicode support. <br>
'''Tcl''' is often combined with the [[Tk]] library,
which provides support for graphics and GUI. <br>
As a result, it is often referred to as '''Tcl/Tk'''.
Tcl is known to be supported under a variety of popular operating systems,
including [[UNIX]], [[Linux]], [[BSD]], [[Windows]], [[WinCE]], [[PocketPC]],
[[Mac OS X]] and [[BeOS]]. <br>
Tcl is distributed under the [[wp:BSD licenses|BSD License]].
;Current version: Tcl/Tk 8.6.3 (2014-11-12)
The Tcl language has been implemented in multiple lower-level languages.
The most common one is '''[[libtcl]]''', written in [[C]], which is
the engine used to power [[tclsh]] and [[wish]], but others exist.
Notably, these include [[Jacl]] and [[Eagle]], which implement
Tcl in [[Java]] and [[C sharp|C#]] respectively.
Its creator, John Ousterhout, wrote about it:
:''“I got the idea for Tcl while on sabbatical leave at DEC's Western Research Laboratory in the fall of 1987. I started actually implementing it when I got back to Berkeley in the spring of 1988; by summer of that year it was in use in some internal applications of ours, but there was no Tk. The first external releases of Tcl were in 1989, I believe. I started implementing Tk in 1989, and the first release of Tk was in 1991.”''
The principal pre-built distributions of Tcl are all based on [[libtcl]];
the main ones are [[ActiveTcl]] from ActiveState,
and [[tclkit]] from Equi4 Software ''et al''. <br>
Older versions of the language are distributed as part of
Apple's OSX and all Linux distributions.
==Language Syntax==
===Grammar===
Note that this is a simplified language grammar, and it is normal
to think of the language at a higher level where these differences don't show.
<br clear=all>
script '''::=''' command'''? ((''' “''\n''” '''|''' “'';''” ''')''' script ''')'''
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