Bash

Link

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

• An sh-compatible shell that incorporates useful features from the Korn shell (ksh) and the C shell (csh)

Resources

• Bash Shell: Take Control of PS1, PS2, PS3, PS4 and PROMPT_COMMAND

  Your interaction with Linux Bash shell will become very pleasant, if you use PS1, PS2, PS3, PS4, and PROMPT_COMMAND effectively. PS stands for prompt statement. This article will give you a jumpstart on the Linux command prompt environment variables using simple examples.