Beyond the Basics of Variables and Loops

Used properly, variables can add power and flexibility to scripts. This requires learning their subtleties and nuances.

Operations on code blocks are the key to structured and organized shell scripts. Looping and branching constructs provide the tools for accomplishing this.

• Internal Variables
• Variable types
• $RANDOM
• Manipulating strings
• Parameter Substitution
• Loops
• Loop control
• Branching
• Command Substitution