Shell Scripting Fundamentals Core patterns and best practices for writing robust, maintainable shell scripts. Script Structure Always start scripts with a proper shebang and safety options: Safety Options Explained - : Exit on any command failure - : Error on undefined variables - : Pipeline fails if any command fails Variables Declaration and Assignment Always Quote Variables Default Values Conditionals Test Syntax Common Test Operators | Operator | Description | |----------|-------------| | | File exists and is regular file | | | Directory exists | | | Path exists | | | Readable | | | Writa…