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<TITLE>The Linux keyboard and console HOWTO: Some properties of the VT100 - application key mode</TITLE>
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<H2><A NAME="s21">21. Some properties of the VT100 - application key mode</A></H2>
<P>
<!--
keyboard!VT100 application key mode
-->
<!--
VT100 application key mode
-->
<P>: Sometimes my cursor keys or keypad keys produce strange codes?
<P>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 <CODE>kill -9</CODE>, or if they crash, then the mode will
not be reset.
<PRE>
% echo -e '\033c'
</PRE>
resets all properties of the current VC. Just changing the cursor
application key mode is done by
<PRE>
% echo -e '\033[?1h'
</PRE>
(set) and
<PRE>
% echo -e '\033[?1l'
</PRE>
(clear).
<P>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
<PRE>
% echo -e '\033='
</PRE>
and
<PRE>
% echo -e '\033>'
</PRE>
clears it again.
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