title: How to replace unix sort plus-notation with -k?
body: <p>This is probably dead simple, but I can't get it to work. How do I correct this <code>sort</code> notation</p>
  
  <p><code>sort +0 -1 something</code></p>
  
  <p>to use more POSIX-compliant <code>-k</code> notation? If I try <code>sort -k 0,1 something</code>, <code>sort</code> just tells me</p>
  
  <pre><code>sort: field number is zero: invalid field specification `0,1'
  </code></pre>
  
  <p>I can't find it in sort documentation anywhere.</p>