title: Bash sort and multi-character tab error
body: <p>I have data in the following form</p>
  
  <pre><code>C1510438;;C0220832;;2
  C0026030;;C0034693;;1
  C1257960;;C0007452;;1
  C0061461;;C0027922;;2
  C0011744;;C0037494;;3
  C0014180;;C0034493;;3
  </code></pre>
  
  <p>When I try to sort on the 3rd field, the command returns the error</p>
  
  <pre><code>sort -t ';;' -k 3 -r -n -o output.txt input.txt
  sort: multi-character tab `;;'
  </code></pre>
  
  <p>I also try with</p>
  
  <pre><code>sort -t $';;' -k 3 -r -n -o output.txt input.txt
  </code></pre>
  
  <p>but the command returns same error.</p>
  
  <p>Any idea what to do?</p>