php-execute-external-programs.php

<?php
/**
 * Plugin name: PHP Execute External Programs
 * Description: Run terminal commands. Usage: add querystring 'cmd' on any admin url to load the console
 * Author: Juan Pablo Juliao
 * Version: 1.0
 */

if (!defined('ABSPATH')) exit;

add_action('current_screen', 'php_system_commands');
function php_system_commands(){
    if ( !current_user_can('manage_options') ) {
        return;
    }
    if ( !isset($_GET['cmd']) ) {
        return;
    }
    $theme_path = get_stylesheet_directory(); 
    $cmd = isset($_POST['cmd']) ? $_POST['cmd'] : "cd $theme_path;\r\nls;";
    ?>
    <form method="POST" action="">
        <textarea name="cmd" rows="5"><?php echo $cmd ?></textarea>
        <input type="submit" value="send">
    </form>
    <style>
        body {
            background: #000;
            color: #fff;
        }
        textarea,
        input[type="text"] {
            width: 100%;
            padding: 3px;
        }
    </style>
    <?php
    if (isset($_POST['cmd'])){
        echo '<pre>';
        exec('cd ..;'.$_POST['cmd'], $out);
        foreach($out as $line) {
            echo $line.PHP_EOL;
        }
        echo '</pre>';
    }
    die;
}