title: Replacing a particular multiline pattern using awk
body: <p>Below is my tab separated file:</p>
  
  <pre><code>$OC90$  BMPR2
  TRA@    CANX
  TRA@    HLA-B
  TRG@    TRD@
  AP2M1   $ZBTB8$
  $ZBTB8$ $ZBTB8$
  </code></pre>
  
  <p>where first and second columns represent Gene Symbols. Some symbols are enclosed by $ and some by @ sign. How to remove these two symbols (@ and $) from file using awk.</p>