The Linux keyboard and console HOWTO: Some properties of the VT100 - application key mode 21. Some properties of the VT100 - application key mode: Sometimes my cursor keys or keypad keys produce strange codes?When the terminal is in application cursor key mode the cursor keys produce Esc O x and otherwise Esc [ x where x is one of A,B,C,D. Certain programs put the terminal in application cursor key mode; if you kill them with kill -9, or if they crash, then the mode will not be reset. % echo -e '\033c' resets all properties of the current VC. Just changing the cursor application key mode is done by % echo -e '\033[?1h' (set) and % echo -e '\033[?1l' (clear).When the terminal is in application keypad key mode the keypad keys produce Esc O y and otherwise Esc [ z ~ for certain y and z. Setting application keypad key mode is done by % echo -e '\033=' and % echo -e '\033>' clears it again. C