The main file [source]d by a Tcl interpreter when starting up.

Has in recent versions become ''more'' important for providing the core language environment, as some core commands ([clock], [info], [string]) that used to be implemented in [C] throughout are now [namespace ensemble]s set up in init.tcl.

See also:
   * [Secrets of the init.tcl library file]
   * [Tcl_Init]
   * [Magic names]
   * [interp create]
   * [TCL_LIBRARY] (esp. regarding "cannot find usable init.tcl" errors after compiling Tcl)
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