$ HTTP_USER_AGENT=MSIE perl myscript.cgi

##</code><code>##

$ HTTP_USER_AGENT=FireFox perl myscript.cgi

##</code><code>##

s**lil*;  $*=join'',sort split q**;  s;.*;grr; &&s+(.(.)).+$2$1+; $; =
qq-$_-;s,.*,ahc,;$,.=chop for split q,,,reverse;print for($,,$;,$*,$/)