Bash

Bash (or Bourne Again Shell) is an sh-compatible command language that runs on a window where the user inputs commands to execute actions. Since its release, it has been used as the default login shell for a majority of Linux distributions.

Bash is a Unix shell and command language written by Brian Fox for the GNU Project as a free software replacement for the Bourne shell. First released in 1989, it has been used as the default login shell for most Linux distributions.