Bash Scripting

Foundations

Variables & Data

Variables, quoting rules, special variables, strings, arithmetic, and arrays.

Control Flow

Conditionals, test expressions, case statements, and all types of loops.

Functions

Defining functions, passing arguments, returning values, and variable scope.

Input & Output

Reading user input, here-docs, printf formatting, and reading files.

File Operations

Reading files line-by-line and testing file types and permissions.

Script Arguments

Positional parameters, getopts for flags, and shift for argument processing.

Error Handling

Exit codes, set options, trap for cleanup, and writing to stderr.

Advanced Topics

Regex matching, process substitution, and debugging techniques.

Practical Scripts

A reusable script template, an rsync backup script, and a system health monitor.