title: How to save a list of all the installed packages in Emacs 24?
body: <p>I am using prelude as a base Emacs configuration.
  I have installed lots of packages from the package manager, and I want to use my settings on another machine. </p>
  
  <p>I don't want to carry the installed packages and also I don't want to create a list manually.</p>
  
  <p>What is the way of saving a list all the installed packages into prelude-package.el or any other file so that when I take this configuration to my other machine, they automatically get installed there on first use?</p>