send password to pg_dump

Hello,

I'm trying to run pg_dump programmatically, and I'm wondering how I can send
it a password.

I'm running it with a system() call in a child process, and sending the
password in from the parent process on stdin, but somehow pg_dump always
finds out how to ask my terminal for a password. How do I fool it?

(I need this to work in linux... in python would be preferable too.)

Thanks for any advice.

- Shaun
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