Linux systems offer a lot of choices for what shell you use. Some you'll love and others you maybe won't, but it's easy to try any of them out and change your shell when you find the one you prefer.

A program (binary, or executable) is a file on disk somewhere, in a recognized format. Common formats include ELF on Linux, ...

Linux built-ins are commands that are part of a user’s shell. Sandra Henry-Stocker explains how to recognize them and get help on their use.

Variables defined in the shell are lost once the session ends. To make them persistent, you need to store them in a shell configuration file. Common Shell Startup Files ~/.bashrc – Runs for ...