<div>Hi, </div><div><br></div><div>My mind is blocked, and need your help.</div><div>I need to use an external filter command to further process my Perl expression calculation, all within an Perl expression. How can I do that?</div>
<div><br></div><div>Let me illustrate with an example, </div><div><br></div><div>I need to calculate 12+34, then pipe this expression result through an external shell filter command, say 'rev'. </div><div><br></div>
<div>ultimately, I'm going to use the whole expression in the second part of string replace 's/.../.../eg' operation. </div><div><br></div><div>Please help. </div><div><br></div><div>Thanks</div><div><br></div>