title: print ruby code during execution
body: <p>Does Ruby have the ability to print out each line of code as it executes during runtime? I'm looking for something similar to Bash's <code>set -x</code> functionality.</p>
  
  <p>Preferably the solution would be something using only the Ruby standard-lib. This would be used in a continuous-integration system so I don't have much control over installed gems.</p>
  
  <p>Thank you in advance</p>