How can I check if there are any programs using a package repo that I added?

sudo apt-get update; apt-cache policy packagename

packaename will need to be replaced by the package you expect to get from the repo

Even if you remove the repo and the package doesn't get updated it doesn't matter, the later versions should backport to allow the app to still run, it just won't get updated.

Thanks that does help me with another problem I was having, but I guess I didn't word my original question right. My current problem is that I don't know what applications I did, or have installed with the GetDeb software repo.

So I guess, to restate my question, how would I check to see if there's any software installed that depends on the GetDeb repo?

some have getdeb in the name. I installed a game from getdeb but its not got the usual text.

try:

dpkg -l | grep get

you could also try:

history | grep dpkg

if you used CLI to install it.

Found out how to do it, in Synaptic package manager you click on the bottom left button that says "Origin" and select your source and scroll through the list and check if there's any software installed. Thanks for all the help guys, I would still appreciate it if someone could inform me of how to do it with the CLI, it helps out when you don't have a GUI to fall back to.

Glad you got the gold and nice share too :)

Hopefully this will help others wanting the same thing.