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→UNIX Structure
***Shell (user interface, command interpreter, and some built-in commands), surrounded by
****Utilities (or commands)
*most common shells: Bourne shell ('''sh'''), C shell ('''csh'''), Korn shell ('''ksh'''), Bourne again shell ('''bash'''), TC shell ('''tcsh'''), Z shell ('''zsh''')
*we'll mostly be concerned with the Bash shell, which is the most popular Linux shell
*the Korn shell is the most popular Unix shell, and is very similar to the Bash shell
