Install tcl by entering the following commands in the terminal:
sudo apt update sudo apt install tcl
Description:
Tool Command Language (default version) - shell
Tcl is a powerful, easy to use, embeddable, cross-platform interpreted scripting language. . This package is a dependency package, which depends on Debian's default Tcl version (currently 8.6).
Version: 8.6.0+9
Section: universe/interpreters