Answer

The example below shows how to execute a shell command from within php script.

The command pwd executes the current working directory.

<?php
$output = shell_exec('pwd');
echo "<pre>$output</pre>";
?>

Drupal notes

• If placed within a drupal node it will always display the base location of the drupal installation.
• If you require to call a program which resides above the drupal directory the following may be used.

  <?
  include("../../legacy/program.php");
  ?>