Tcl is a simple to use text-based scripting language with many built-in features that make it especially nice for writing interactive scripts similar to perl.
The TCL shell is /usr/bin/tclsh8.0
This package is required if you want to install Tk.
The bytecode compiler is new. The core of the Tcl interpreter has been replaced with an on-the-fly compiler that translates Tcl scripts to byte codes.