title: Torch / Lua after installation is not working
body: <p>I have followed the following approach in order to install Torch in my machine (Mac).</p>
  
  <p><a href="http://torch.ch/docs/getting-started.html#_" rel="noreferrer">http://torch.ch/docs/getting-started.html#_</a></p>
  
  <p>When I am done with the installation, I type:</p>
  
  <p><code>$ luarocks install image</code>
  or <code>$ luarocks lis</code></p>
  
  <p>or <code>$th</code> </p>
  
  <p>in order to load the <code>th</code> or to make updates on the lua packages. It says  "command not found". Do you have any idea how I can resolve this issue? </p>