title: Rename multiple files with sed
body: <p>How can i rename files with titles like <code>Stargate SG-1 Season 01 Episode 01</code> to just "s01e01"? Variable numbering of course.
  I already have something like this: </p>
  
  <blockquote>
    <p><code>for file in *.mkv; do mv "$file" "$(echo "$file" | sed -e "REGEX HERE")</code></p>
  </blockquote>
  
  <p>I just need the sed command that does what i need.</p>
  
  <p>Thanks</p>