Chapter 9. The Operating System
74
<  
generates
KB_BackSpace
in X.
Delete
generates
KB_Delete
in X.
  X translations are set up to make
KB_Backspace
generate ASCII DEL, and to make
KB_Delete
generate
ESC [ 3 ~
(this is the vt220 escape code for the  delete character 
key). This must be done by loading the X resources using
xrdb
on all local X displays,
not using the application defaults, so that the translation resources used correspond to
the
xmodmap
settings.
  The Linux console is configured to make
<  
generate DEL, and
Delete
generate
ESC
[ 3 ~
.
  X applications are configured so that
<
deletes left, and
Delete
deletes right. Motif
applications already work like this.
  Terminals should have
stty erase ^?
.
  The
xterm
terminfo entry should have
ESC [ 3 ~
for
kdch1
, just as for
TERM=linux
and
TERM=vt220
.
  Emacs is programmed to map
KB_Backspace
or the
stty erase
character to
delete backward char
, and
KB_Delete
or
kdch1
to
delete forward char
, and
^H
to
help
as always.
  Other applications use the
stty erase
character and
kdch1
for the two delete keys,
with ASCII DEL being  delete previous character  and
kdch1
being  delete character
under cursor .
This will solve the problem except for the following cases:
  Some terminals have a
<  
key that cannot be made to produce anything except
^H
. On
these terminals Emacs help will be unavailable on
^H
(assuming that the
stty erase
character takes precedence in Emacs, and has been set correctly).
M x help
or
F1
(if
available) can be used instead.
  Some operating systems use
^H
for
stty erase
. However, modern telnet versions and
all rlogin versions propagate
stty
settings, and almost all UNIX versions honour
stty
erase
. Where the
stty
settings are not propagated correctly, things can be made to
work by using
stty
manually.
  Some systems (including previous Debian versions) use
xmodmap
to arrange for both
<  
and
Delete
to generate
KB_Delete
. We can change the behavior of their X clients
using the same X resources that we use to do it for our own clients, or configure our
clients using their resources when things are the other way around. On displays config 
ured like this
Delete
will not work, but
<  
will.
  Some operating systems have different
kdch1
settings in their
terminfo
database for
xterm
and others. On these systems the
Delete
key will not work correctly when you
log in from a system conforming to our policy, but
<  
will.






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