To add to that, C-P will go up in your history and C-N down. It is extra useful when using GDB in TUI mode (which is activated using C-x,a), which will capture your UP/DOWN arrow to navigate the source...

Actually, just go read http://ss64.com/bash/syntax-keyboard.html or something, once per day, integrate a new one each time, and you will improve your productivity on the command line (as well as comfort).