 Shells and
        Utilities, Section 4, Utilities, egrep.</a>
      </p>
<p>
        <a href="http://www.opengroup.org/onlinepubs/000095399/utilities/awk.html" target="_top">IEEE
        Std 1003.1-2001, Portable Operating System Interface (POSIX ), Shells and
        Utilities, Section 4, Utilities, awk.</a>
      </p>
</div>
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