* Confusion about Undo keybinding
@ 2016-02-11 17:15 Kevin Havener
2016-02-11 20:28 ` Emanuel Berg
0 siblings, 1 reply; 3+ messages in thread
From: Kevin Havener @ 2016-02-11 17:15 UTC (permalink / raw)
To: help-gnu-emacs
According to the tutorial and other places, undo is bound by default to
C-/, C-_, and C-x u. However in my newly installed emacs 24.5, C-/ is
bound to DEL (backspace). I don't think I have any .emacs type file
overriding the defaults, so is this wrong or is the documentation wrong?
Wait just a minute. C-/ is bound to undo in graphical mode and in xterm
(-nw) mode. C-/ is bound to DEL in my linux virtual consoles. How is
this possible?
Can you tell me what is going on?
Thank you,
Kevin Havener
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Confusion about Undo keybinding
[not found] <mailman.4403.1455218497.843.help-gnu-emacs@gnu.org>
@ 2016-02-11 19:42 ` Barry Margolin
0 siblings, 0 replies; 3+ messages in thread
From: Barry Margolin @ 2016-02-11 19:42 UTC (permalink / raw)
To: help-gnu-emacs
In article <mailman.4403.1455218497.843.help-gnu-emacs@gnu.org>,
Kevin Havener <havenerk@gmail.com> wrote:
> According to the tutorial and other places, undo is bound by default to
> C-/, C-_, and C-x u. However in my newly installed emacs 24.5, C-/ is
> bound to DEL (backspace). I don't think I have any .emacs type file
> overriding the defaults, so is this wrong or is the documentation wrong?
>
> Wait just a minute. C-/ is bound to undo in graphical mode and in xterm
> (-nw) mode. C-/ is bound to DEL in my linux virtual consoles. How is
> this possible?
In terminal mode, only ASCII characters can be used, and there is no
ASCII C-/ character. When you type C-/ it sends the DEL character, I
think because this is what Teletype terminals in the 70's did (or maybe
it's what DEC VTxxx terminals did).
--
Barry Margolin, barmar@alum.mit.edu
Arlington, MA
*** PLEASE post questions in newsgroups, not directly to me ***
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Confusion about Undo keybinding
2016-02-11 17:15 Confusion about Undo keybinding Kevin Havener
@ 2016-02-11 20:28 ` Emanuel Berg
0 siblings, 0 replies; 3+ messages in thread
From: Emanuel Berg @ 2016-02-11 20:28 UTC (permalink / raw)
To: help-gnu-emacs
Kevin Havener <havenerk@gmail.com> writes:
> I don't think I have any .emacs type file overriding
> the defaults
You can check this with emacs -Q.
> C-/ is bound to undo in graphical mode and in xterm
> (-nw) mode.
I wouldn't call this "xterm mode" as just about any
terminal emulator (urxvt, Gnome terminal, etc.) should
be able to do this.
But actually the Emacs help mentions xterm:
-nw, --no-window-system
Tell Emacs not to create a graphical frame. If you use
this switch when invoking Emacs from an xterm(1) window,
display is done in that window.
> C-/ is bound to DEL in my linux virtual consoles.
> How is this possible?
Here is a tutorial if you want to rebind it:
http://user.it.uu.se/~embe8573/tty-emacs-keys.txt
use, e.g.:
(define-key input-decode-map [?\u0114] [C-/])
> Can you tell me what is going on?
The Linux VTs are not the same as X. xterm may appear
closer to the Linux VTs but it is not: it *is*
"x"term, aye?
PS. I have `undo' M-0 - very fast, close, and
ergonomic if I may... DS.
--
underground experts united
http://user.it.uu.se/~embe8573
^ permalink raw reply [flat|nested] 3+ messages in thread
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2016-02-11 17:15 Confusion about Undo keybinding Kevin Havener
2016-02-11 20:28 ` Emanuel Berg
[not found] <mailman.4403.1455218497.843.help-gnu-emacs@gnu.org>
2016-02-11 19:42 ` Barry Margolin
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