title: Change ID string in vcf file with awk
body: <p>I have a VCF file with SNP IDs like this:</p>
  <pre><code>AX-14233402__rs35404821
  AX-37499887__rs74704183
  AX-36783275__rs11997571
  </code></pre>
  <p>I would like to change the SNP IDs to have only the IDs without the <code>AX-...</code> term:</p>
  <pre><code>rs35404821 
  rs74704183 
  rs74704183
  </code></pre>
  <p>Is there any solution for this? I tried with a gsub command, but nothing changed:</p>
  <pre><code>awk '{gsub(/AX*_rs/,&quot;rs&quot;); print}' datafile.vcf &gt; datafile_ID.vcf
  </code></pre>