title: How split a file in words in unix command line?
body: <p>I'm doing a faster tests for a naive boolean information retrival system, and I would like use awk, grep, egrep, sed or thing similiar and pipes for split a text file into words and save them into other file with a word per line. Example my file cotains:</p>
  <pre><code>Hola mundo, hablo español y no sé si escribí bien la
  pregunta, ojalá me puedan entender y ayudar
  Adiós.
  </code></pre>
  <p>The output file should contain:</p>
  <pre><code>Hola
  mundo
  hablo
  español
  ...
  </code></pre>
  <p>Thank!</p>