I had a prof who would do all his lectures & demos from the command line.
Need to write a short C program to demonstrate forking? Boom! Into vim and coding up a basic example in a minute or two.
Typo in his LaTeX slides? Boom! Switch over to fix it, then recompile the slides, and on with the lecture.
Student asks a question about a command line argument? Boom! Man pages up on the big screen.
It was a little intimidating to see this CLI master hopping around typing crazy little combinations of letters and making magic appear on the screen, but at the same time it was inspiring. It was an example of what we could aspire towards.