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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 % 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.
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