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The following pages and posts are tagged with

Basic Math in BASH Page Addition, Subtraction, Multiplication, and Division in the Shell
Basic Text Manipulation in BASH Page A Basic Primer on Manipulating Text
Conditional Expressions Page Testing for specific conditions in your script
Grabbing User Input Page Making your shell scripts interactive
BASH by Example Page Shell-Scripting is a 1950's Jukebox - Larry Wall
Iteration in BASH Page How to execute a set of instructions multiple times