Refs

• C - control. So C-a means to hit the control key and the a key.
• M - alt/meta

terminal

• C-p = previous command
• C-u= erase line before cursor
• C-l = refresh screen
• C-M-t = new terminal window

Vim

• sudo apt-get install vim

.vimrc

:inoremap jk <Esc>
set relativenumber