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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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while

while performs a block of statements as long as a particular condition is true:

while ($x<10) {     print "$x\n";     $x++;}

Remember that the condition can be anything that returns a true or false value. For example, it could be a function call:

while ( InvalidPassword($user, $password) )        {        print "You've entered an invalid password. Please try again.\n";        $password = GetPassword;}

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