Tclsh
Tclsh is an implementation of Tcl.
Other implementations of Tcl.
tclsh is a shell for the Tcl programming language. It is the primary implementation of Tcl as it is distributed with, built with, and a thin wrapper around libtcl, and it is normally used in command-line environments. In graphical environments, it is more common to use wish instead, though this is a historical hold-over except on Windows.