system ("newgrp ankoor <<BLAH\n cleartool setview -exec \"cleartool ln
+ -s $rtl_compiles_dir/$new_release $topsim_dir/SIMULIBS/vcsmx/$new_re
+lease\" $view_name \n 2>>$0.ERR") 
if (!$flag_link);
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I want to find a way to make the above command work or a suitable alternative would do.

Seems like a valid question to me. OP wants to be able to run this in perl (or to have a perl replacement to this command)...

Don't know exactly in detail what this command does, but newgrp changes the current group ID during a login session, so this seems a problem related with to modify "$(" and/or "$)". You could find useful also POSIX::setgid() for this problem instead newgrp

use POSIX qw(setgid);
$my_new_group_id = POSIX::setgid();
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Another question is if your here-doc is correctly formated, I can see the start of the here-doc <<BLAH, but I can't find the last BLAH closing the here-doc