The problem with your jk solution is that it doesn’t work in other Vi-like interfaces such as those provided by readline or shells. Also ctrl-h is backspace so

The problem with your jk solution is that it doesn’t work in other Vi-like interfaces such as those provided by readline or shells. Also ctrl-h is backspace so mapping caps to ctrl gives you a convenient escape and backspace shortcut. (It also gives you a heap more terminal shortcuts but that’s another story).