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

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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

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