A shell is a crucial part of an Unix-based operating system and is the main interface we can use to interact with the system itself. Bash is without doubt the most used shell on the majority of Linux distributions: it was born as the free software replacement for the
Bourne shell (bash is the acronym for Bourne-again shell) inside the GNU project. In this tutorial we will learn how some of the most useful bash expansions works.
This is a companion discussion topic for the original entry at https://linuxconfig.org/introduction-to-bash-shell-parameter-expansions