title: looking for specific errors in a log within the past hour
body: <p>I have a log that I need to audit every hour going back an hour. I currently run a command and just keep track of what I have accounted for in it's output but having an hourly audit would make things a lot easier. I've left off the additional grep filters for this output since I do not believe they are necessary. </p>
  
  <p>How can I make this command output lines from the last hour up to now.</p>
  
  <pre><code>cat error.log | grep `date -u "+%Y-%m-%d"`| grep -i dangling*
  </code></pre>