Editing One-liner program (section)

===Tcl===
[[Tcl]] (Tool Command Language) is a dynamic programming/scripting language based on concepts of Lisp, C, and Unix shells. It can be used interactively, or by running scripts (programs) which can use a package system for structuring.<ref>Following are direct quotes from {{Wikibooks-inline|Tcl Programming}} that are available under the [[Creative Commons Attribution-ShareAlike License]].</ref>

Many strings are also well-formed lists. Every simple word is a list of length one, and elements of longer lists are separated by whitespace. For instance, a string that corresponds to a list of three elements:
<syntaxhighlight lang="TCL">
set example {foo bar grill}
</syntaxhighlight>

Strings with unbalanced quotes or braces, or non-space characters directly following closing braces, cannot be parsed as lists directly. You can explicitly split them to make a list.

The "constructor" for lists is of course called list. It's recommended to use when elements come from variable or [[command substitution]] (braces won't do that). As Tcl commands are lists anyway, the following is a full substitute for the list command:
<syntaxhighlight lang="TCL">
proc list args {set args}
</syntaxhighlight>