I think some distros disable using RSA by default. Might need to use it explicitly.

Original grep was pretty much a wrapper around sed (or actually maybe ed, I don’t remember). That’s why it’s called g/re/p, which is the sed command to do the same thing.

I don’t know if it’s that cut and dry. If you study a Operative Systems class or buy a book about them, it’ll exclusively deal with the kernel.

Are reading what you write? It’s linux so it isn’t?