You should check out Harvard's CS50x on edx. It's probably the best introduction to CS and programming online and teaches you the basics of the command line an

You should check out Harvard's CS50x on edx. It's probably the best introduction to CS and programming online and teaches you the basics of the command line and C along the way. Depending on the CS program, it's roughly equivalent of the first 1-3 semesters at a more average university, but the quality of the pedagogy is so high that it's very doable for anyone willing to put in the work.