bash

Bash (Bourne-Again SHell): The ubiquitous command language interpreter and scripting engine for GNU/Linux and macOS systems.

Bash is the GNU Project's powerful shell, serving as the default command interpreter for most Linux distributions and a widely used option on macOS. Developed by Brian Fox in 1989, its name is an acronym for 'Bourne-Again SHell,' signifying its compatibility with the original Bourne Shell (sh) while incorporating advanced features from shells like ksh and csh. The technology provides a robust environment for interactive command execution and non-interactive shell scripting, supporting critical functions like command-line editing, job control, and complex programming constructs (loops, conditionals, functions) for system automation.

https://www.gnu.org/software/bash/