That's the link in this post so yeah, I read that. It covers most of the stuff that happens inside the Postgres CLI which is good, but I also need to know about the things I can do directly from the Linux shell.

How to backup a Postgres DB?

    mysqldump -u user -p DB > dump.sql

Import a DB from the Linux command line?

    mysql -u user -p DB < dump.sql

How to run a command directly from a shell script?

    mysql -u [user] -p[pass] -e "[mysql commands]"

When managing systems, this stuff is more important to me than the actual Postgres syntax.