 <code>-</code> and should be used in
scripts passing user input to grep.  Multiple patterns are
combined by <em>or</em>.</p>
</dd>
<dt class="hdlist1">--and</dt>
<dt class="hdlist1">--or</dt>
<dt class="hdlist1">--not</dt>
<dt class="hdlist1">( &#8230;&#8203; )</dt>
<dd>
<p>Specify how multiple patterns are combined using Boolean
expressions.  <code>--or</code> is the default operator.  <code>--and</code> has
higher precedence than <code>--or</code>.  <code>-e</code> has to be used for all
patterns.</p>
</