A command-line interface or command language interpreter (CLI), also known as command-line user interface, console user interface, and character user interface (CUI), is a means of interacting with a computer program where the user (or client) issues commands to the program in the form of successive lines of text (command lines).
I was trying to update one of my server that has some Opensuse repositories and received this error “W: GPG error: https://download.opensuse.org Release: The following signatures were invalid: KEYEXPIRED 1501595774” …