title: How to separate columns in linux using awk or cat
body: <p>I have a file with 900.000 columns, the structure is:</p>
  <pre><code>1613 1200000012000500000011111.......
  112345 1200000012000500000011111.......
  1287659 1200000012000500000011111.......
  1234 1200000012000500000011111....... 
  712826  1200000012000500000011111.......
  </code></pre>
  <p>I need only the numbers before the space, this is a new file as:</p>
  <pre><code>1613 
  112345 
  1287659 
  1234 
  712826 
  </code></pre>
  <p>I try with</p>
  <pre><code>cat -df.txt |cut -d |,| -f7
  </code></pre>
  <p>but it does not work.</p>