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Practical Programming in Tcl & Tk, Third Edition by Brent B. Welch

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Tcl Shell Library Environment

Tcl searches for its script library directory when it starts up. In early versions of Tcl you had to compile in the correct location, set a Windows registry value, or set the TCL_LIBRARY environment variable to the correct location. Recent versions of Tcl use a standard searching scheme to locate the script library. The search understands the standard installation and build environments for Tcl, and it should eliminate the need to use the TCL_LIBRARY environment variable. On Windows the search for the library used to depend on registry values, but this has also been discontinued in favor of a standard search. In summary, “it should just work.” However, this section explains how Tcl finds its script library so that ...

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