Comment Re:What is this? (Score 0, Flamebait) 383
Less useful but still useful are command shells. These provide file management mostly. I believe some of them may allow for sending and retrieving email messages.
Holy shit, you can start off with DOS for Dummies and work your way up from there.
But anyway, I will attempt to answer your question:
What else is out there?
Every program on every major operating system can be launched from the shell, and 99% of these can accept command line arguments. Is there any other vague, poorly-thought-out questions you'd like to ask?