title: How to use expr within an if condition
body: <p>I have the following if condition:</p>
  
  <pre><code>STATUSFILE = "foo.status"
  NEWTIME=1389253927
  if [ -f $STATUSFILE ] &amp;&amp; [ expr $NEW_TIME - cat $STATUSFILE -gt 3600 ]; then
      echo "foo"
  fi;
  </code></pre>
  
  <p>and I get [: too many arguments</p>