title: rename fastq file headers using sed command
body: <p>I am trying to rename the fastq header and add &quot;/1&quot; at the end of fastq header using sed commmand.
  Here is my code:</p>
  <pre><code>sed i '1~4 s/$/\\1/g' seq/*_1.fq
  </code></pre>
  <p>But no change has been made. Does someone know how to solve this? Thanks!</p>