I am trying to login to the website www.centralgreen.com.sg/login.php using cURL (first time user of cURL)
I used the Tamper plugin for Firefox, and I have 4 POST inputs
Try using the -F option instead of --data.
-F
--data
http://curl.haxx.se/docs/manpage.html#-F
Basically, this changes the content type header to:
Content-Type: multipart/form-data
This may give you a better result.