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Ubuntu Unleashed 2014 Edition: Covering 13.10 and 14.04,Ninth Edition by Paul Hudson, Andrew Hudson, Matthew Helmke

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The while Statement

You can use the while statement to execute a series of commands while a specified condition is true. The loop terminates as soon as the specified condition evaluates to false. It is possible that the loop will not execute at all if the specified condition initially evaluates to false. You should be careful with the while command because the loop never terminates if the specified condition never evaluates to false.

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