How do I find the width & height of a terminal window?

Question

As a simple example, I want to write a CLI script which can print '=' across the entire width of the terminal window.

#!/usr/bin/env php
<?php
echo str_repeat('=', ???);

or

#!/usr/bin/env python
print '=' * ???

or

#!/usr/bin/env bash
x=0
while [ $x -lt ??? ]; do echo -n '='; let x=$x+1 done; echo

Answer 1

tput can tell you columns. I'm not sure about height, though.
tput cols man page.

Answer 2

yes = | head -n$(($(tput lines) * $COLUMNS)) | tr -d '\n'

Answer 3

In bash, the $LINES and $COLUMNS environmental variables should be able to do the trick. The will be set automatically upon any change in the terminal size. (i.e. the SIGWINCH signal)