I found that we can read gmail messages from a terminal window by using

curl

curl -u user --silent "https://mail.google.com/mail/feed/atom"

I would now like to submit some text (from a textarea + button press) from terminal. So what are the steps to identify the action triggered when a button is pressed and how to simulate the same actions in terminal ?

For example, I want to simulate 'pass data' & 'button press' (submit ) of http://tokira.net/unicode/index.php