Programming :: Click 'submit' In A Remote Web Form From Bash?

I have created a simple web form which pokes a PHP script:

<form name="update" action="http://www.mysite.com/script.php" method="POST">
<input name="submit" type="submit" value="submit">
</form>

I can easily surf along to the URL [URL] and click the submit button which pokes script.php and everyone's happy. Automating this in iMacros or Selenium - no problem.

I want to automate this in a bash cron on the same server - preferably as a one-liner.

I *thought* something like this might work:

Code:
wget --spider --post-data="submit=submit" http://www.mysite.com/wget.html

or

Code:
curl -d "submit=submit" http://www.mysite.com/wget.html

and many variations thereof but no luck.

Is there ANY way I can click the submit button from a Bash command line? Curl, wget, lynx - one of these simply MUST be capable of this.

I do not want to run script.php from the command line - there are loads of relative links etc.