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Ubuntu Unleashed 2013 Edition: Covering 12.10 and 13.04, Eighth Edition by Matthew Helmke

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Looping

A loop is a way to repeat a program action multiple times. A simple example is a countdown timer that performs a task (waiting for one second) 300 times before telling you that your egg is done boiling.

Looping constructs (also known as control structures) can be used to iterate a block of code as long as certain conditions apply, or while the code steps through (evaluates) a list of values, perhaps using that list as arguments.

Perl has four looping constructs: for, foreach, while, and until.

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