I would 
my $cmd = "tac temp.xx | sed -n '/$mod /,/YYY/ p'| grep XXX";
print "executing: '$cmd'\n";
$hier = `$cmd`;
print "result: '$hier'\n";

[download]
to actually see what's going on.

In reply to Re^3: Sed in perl by soonix
in thread Sed in perl by abhay180

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