       (( EXP1 ))
        while (( EXP2 )); do
                COMMANDS
                (( EXP3 ))
        done
</pre>
<p> EXP1, EXP2, and EXP3 are arithmetic expressions. If any expression is
    omitted, it behaves as if it evaluates to 1.

</p>

<p> Exit Status:<br/>
    Returns the status of the last command executed.</p>

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