vim

One of the difficulties with learning how to use the Vim text editor is the number of commands that must be learned in order to edit text quickly. While only a minimal set of commands must be known to start using Vim, editing text will be more laborious than in a conventional editor until this set is expanded.

Vim is a monster of a program, and it isn’t alone. Linux is chock full of incredibly powerful applications like Vim, emacs, sed, awk, or even bash itself. And learning to use any of these tools well requires a lot of time investment.