If I want to install restricted (closed source) software like Steam in Ubuntu, I have to use Software Centre.
Is there anyway to install such software right from the command line?
This answer assumes that you want to install Steam. Please look at the software’s documentation for help with installing other third party software.
Open the terminal and run:
The first line downloads and adds the signing key to your keymanager and the second line adds the actual repository to your system. I'm on 13.04 but Steam's installer used