<p>perl -e '$a=`cat file.txt`;if (grep(/foo/,$a)&amp;&amp;(grep(/blah/,$a))){print "YES\n"}else{print "NO\n"}';</p> <p>NOTE1: back-tics do not show up on this site. Should be BACK-TIC cat file.txt BACK-TIC (correction - back-tics do show up if escaped)</p> <p>NOTE2: And file.txt is from the above example:</p> <pre><code>stuff blah explore morestuff explore here foo </code></pre>