delete button in console

[Sergei G]

Thanks all

I have added bindkey "\e[3~" delete-char to my ~/.cshrc file and Delete,
Home and End buttons work now.

The file content is very close to the default, so I am providing portion of
.cshrc for your reference:

if ( $?tcsh ) then
   #
http://stackoverflow.com/questions/1912328/how-to-map-delete-and-end-keys-on-tcsh-shell
   # Delete
   bindkey "\e[3~" delete-char
   # Home
   bindkey "\e[1~" beginning-of-line
   # End
   bindkey "\e[4~" end-of-line
   bindkey "^W" backward-delete-word
   bindkey -k up history-search-backward
   bindkey -k down history-search-forward
endif


On Tue, Dec 29, 2015 at 2:26 PM, Bertram Scharpf <lists at bertram-scharpf.de>
wrote:

> Hi,
>
> On Tuesday, 29. Dec 2015, 14:53:32 -0553, William A. Mahaffey III wrote:
> > On 12/29/15 11:14, Polytropon wrote:
> > > On Tue, 29 Dec 2015 01:48:49 -0800, Sergei G wrote:
> > >> When I ssh to a FreeBSD machine and press 'Delete' button in csh
> prompt
> > >> I get character '~' printed on screen.  Backspace works just fine.
> > >>
> > >> I think even an actual console behaves the same way.
> > >>
> > >> Is there a way to "map" the Delete button to work appropriately? Would
> > >> it be my SSH client application or FreeBSD itself?
> > > This is a thing that can be configured for the shell. I assume
> > > you're using FreeBSD's default dialog shell, the C shell. In
> > > this case, add to ~/.cshrc:
> > >
> > >     bindkey ^? delete-char          # for console
> > >     bindkey ^[[3~ delete-char       # for xterm
> > >
> > > Or to /etc/csh.cshrc, if you want to make it a global setting.
> > >
> > > You can check the success with the "stty -a" command.
> >
> > Is this keyboard dependent ? My keyboard apparently sends '^?' for its
> > backspace key. When I try the above, then 'stty -a', I see no setting.
>
> I cannot see what stty should have to do with it. stty's
> "erase" and "erase2" do only work when icanon is set.
>
> Unfortunately "stty -a" yields wrong results because the
> shell changes the parameters before entering the "stty"
> program. To determine the true values, do the following.
>
>   $ tty
>   /dev/pts/5
>
> Here, 5 could be any number depending on what was allocated
> when the emulator window was started. Then open another
> terminal and ask there:
>
>   $ stty -a -f /dev/pts/5
>
> Of course, replace the 5 by the right number. You will see a
> "-icanon". Notice the minus in front of the property. That
> means every key pressed will be passed to the command line
> editor immediately.
>
> If icanon is on, the line must be completed by pressing
> enter or return (^M) and after that the characters will be
> passed to the input-processing program. In this mode the
> backspace (^H) deletes characters and the input routine will
> not be aware they were pressed at all.
>
> "delete-char" is a csh function (man csh). Probably there is
> something like delete-char-to-left that will be executed on
> backspace (^H). I did not find it. In Zsh its name is
> "backward-delete-char".
>
> By the way, you can explore the escape codes produced by
> arrow keys etc. using the dd program. Just say
>
>   $ dd
>
> and play around with the Ins/Del/Home/End/Fx etc. keys. As
> long as dd runs, icanon is set. Convince yourself of that by
> executing the above stty command again. Leave dd by pressing
> Ctrl-C.
>
> Bertram
>
>
> --
> Bertram Scharpf
> Stuttgart, Deutschland/Germany
> http://www.bertram-scharpf.de
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