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copied!<p>The <a href="http://www.w3.org/TR/html401/interact/forms.html#adef-action" rel="nofollow">action attribute</a> of a form expects a URI to be specified. Instead, there is a <a href="http://www.php.net/manual/en/function.exec.php" rel="nofollow">exec</a> function which returns a string. I'm assuming this string is not a valid URI. So in the source of the html it will look something like this:</p> <pre><code><form action=some string returned by exec> </code></pre> <p>What is happening is the following:</p> <ol> <li>The page is loaded</li> <li>exec('sed....') is processed and the result is put in the html</li> <li>User clicks submit and is taken to the URI specified in action. In this case it is the last line from the result of exec('sed....')</li> </ol> <p>I recommend that you simplify this by changing the form to post to another page <code><form action="changeFile.php"></code> then in changeFile.php add logic to modify the VPS file.</p> <p>For example, in changeFile.php add logic to change the content with something like this:</p> <pre><code><?php exec("sed -i 's/animal=*/animal=$_REQUEST['type']/g' /home/user1234/animals/file.props"); echo 'file modified' ?> </code></pre> <p>This could also be accomplished by having the page post to itself with something like the following:</p> <pre><code><?php ini_set('display_errors', 1); ini_set('error_reporting', E_ALL); if(!empty($_REQUEST['animal_type'])){ exec('sed -i '.escapeshellarg('s/animal=*/animal='.$_REQUEST['animal_type'].'/g')." /home/user1234/animals/file.props"); echo 'File has been updated'; } ?> <form method="post" action="<?php echo $_SERVER['PHP_SELF']; ?>"> <select name="animal_type">; <option value="true">bat</option>; <option value="false">fish</option>; <option value="cat">cat</option>; <option value="dog">dog</option>; </select> <input type="submit" name="Submit" value="Submit" /> </form> </code></pre>

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