Good Bash Scripting Tutorial

this is a good tutorial i found about Bash Scripting that cover really all you need to know!

here's a list of some of the topics it covers:

Variables
Passing arguments to the bash script
Executing shell commands with bash
Reading User Input
Arrays
Bash if / else / fi statements
Nested if/else
Bash Comparisons
Bash File Testing
Loops
Bash Functions
Bash Select
Bash quotes and quotations
Arithmetic Operations
Redirections

hope this will be helpful!