title: Is there a way to ignore header lines in a UNIX sort?
body: <p>I have a fixed-width-field file which I'm trying to sort using the UNIX (Cygwin, in my case) sort utility.</p>
  
  <p>The problem is there is a two-line header at the top of the file which is being sorted to the bottom of the file (as each header line begins with a colon).</p>
  
  <p>Is there a way to tell sort either "pass the first two lines across unsorted" or to specify an ordering which sorts the colon lines to the top - the remaining lines are always start with a 6-digit numeric (which is actually the key I'm sorting on) if that helps.</p>
  
  <p>Example:</p>
  
  <pre><code>:0:12345
  :1:6:2:3:8:4:2
  010005TSTDOG_FOOD01
  500123TSTMY_RADAR00
  222334NOTALINEOUT01
  477821USASHUTTLES21
  325611LVEANOTHERS00
  </code></pre>
  
  <p>should sort to:</p>
  
  <pre><code>:0:12345
  :1:6:2:3:8:4:2
  010005TSTDOG_FOOD01
  222334NOTALINEOUT01
  325611LVEANOTHERS00
  477821USASHUTTLES21
  500123TSTMY_RADAR00
  </code></pre>