"For those just starting out with Linux, or the command line
specifically, the program that displays the command prompt and
handles your commands is called bash, or the Bourne Again Shell. In
this article we'll be using the words command line and shell
interchangeably to refer to interacting with Linux through
bash.
"Today we’ll be covering:
Changing the shell startup routine
Making a more useful command prompt
Creating aliases for long or complex commands"