Backspace problem on GDB

Backspace problem on GDB

[José Tomás Eterovic]

Hi

I'm using gdb 6.3.0.0-1.132.EL4rh, and when I press the backspace key
(trying to delete the left character) I'm deleting the complete word
to my left, anyone has an idea about what's going on here and how can
I fix that?

Best Regards

Jose Eterovic

Re: Backspace problem on GDB

[Brian Dessent]

José Tomás Eterovic wrote:

> I'm using gdb 6.3.0.0-1.132.EL4rh, and when I press the backspace key
> (trying to delete the left character) I'm deleting the complete word
> to my left, anyone has an idea about what's going on here and how can
> I fix that?

Do you have something strange in $HOME/.inputrc or /etc/inputrc?  gdb
uses the readline library for interactive input and those are the config
files it reads at startup.  If you do have either or both of them try
temporarily moving/renaming them away and see if the problem goes away. 
It is a little strange that this wouldn't happen in other apps though,
because e.g. bash also uses readline.

Brian

Re: Backspace problem on GDB

[José Tomás Eterovic]

I'm using csh, so didn't realize I had the same problem on bash (and I
do have it), $HOME/.inputrc doesn't exist, but /etc/inputrc has
# do not bell on tab-completion
#set bell-style none

set meta-flag on
set input-meta on
set convert-meta off
set output-meta on

# Completed names which are symbolic links to
# directories have a slash appended.
set mark-symlinked-directories on

$if mode=emacs

# for linux console and RH/Debian xterm
"\e[1~": beginning-of-line
"\e[4~": end-of-line
"\e[5~": beginning-of-history
"\e[6~": end-of-history
"\e[3~": delete-char
"\e[2~": quoted-insert
"\e[5C": forward-word
"\e[5D": backward-word
"\e[1;5C": forward-word
"\e[1;5D": backward-word

# for rxvt
"\e[8~": end-of-line

# for non RH/Debian xterm, can't hurt for RH/DEbian xterm
"\eOH": beginning-of-line
"\eOF": end-of-line

# for freebsd console
"\e[H": beginning-of-line
"\e[F": end-of-line
$endif

I don't have root access to the machine, so if you could tell me what
can I put on .inputrc to fix that would be great

Best Regards

Jose Eterovic

On Wed, Mar 19, 2008 at 6:03 PM, Brian Dessent <brian@dessent.net> wrote:
> José Tomás Eterovic wrote:
>
>  > I'm using gdb 6.3.0.0-1.132.EL4rh, and when I press the backspace key
>  > (trying to delete the left character) I'm deleting the complete word
>  > to my left, anyone has an idea about what's going on here and how can
>  > I fix that?
>
>  Do you have something strange in $HOME/.inputrc or /etc/inputrc?  gdb
>  uses the readline library for interactive input and those are the config
>  files it reads at startup.  If you do have either or both of them try
>  temporarily moving/renaming them away and see if the problem goes away.
>  It is a little strange that this wouldn't happen in other apps though,
>  because e.g. bash also uses readline.
>
>  Brian
>

Re: Backspace problem on GDB

[Michael Snyder]

On Wed, 2008-03-19 at 18:08 -0300, José Tomás Eterovic wrote:
> I'm using csh, so didn't realize I had the same problem on bash (and I
> do have it), $HOME/.inputrc doesn't exist, but /etc/inputrc has
[...]


That seems to be the default /etc/inputrc, as supplied by 
(for example) fedora.

This should not be the source of your problem.

Re: Backspace problem on GDB

[Brian Dessent]

José Tomás Eterovic wrote:

> I don't have root access to the machine, so if you could tell me what
> can I put on .inputrc to fix that would be great

What does "echo $TERM" say and what terminal are you using?  What gets
sent when you press backspace?  You can find out the latter with most
shells by first pressing control-V then the key in question.  It should
be either ^H or ^? if it's anything like most standard terminals.  You
can fool around with putting something like

"C-H"  backward-delete-char

or

"C-?"  backward-delete-char

in your $HOME/.inputrc, or as appropriate for whatever sequence your
terminal sends for backspace.  There should be a readline man page on
the system too that you can consult.

Brian

Re: Backspace problem on GDB

[Alm P]

This was good information and it helped me a lot. Thanks.

One note: You should put "^?" (quote-carat-questionmark-quote) instead of
"C-?" which might be a typo in Brian's email. The latter kept deleting
capital C.

-AP


Brian Dessent wrote:
> 
> José Tomás Eterovic wrote:
> 
>> I don't have root access to the machine, so if you could tell me what
>> can I put on .inputrc to fix that would be great
> 
> What does "echo $TERM" say and what terminal are you using?  What gets
> sent when you press backspace?  You can find out the latter with most
> shells by first pressing control-V then the key in question.  It should
> be either ^H or ^? if it's anything like most standard terminals.  You
> can fool around with putting something like
> 
> "C-H"  backward-delete-char
> 
> or
> 
> "C-?"  backward-delete-char
> 
> in your $HOME/.inputrc, or as appropriate for whatever sequence your
> terminal sends for backspace.  There should be a readline man page on
> the system too that you can consult.
> 
> Brian
> 
> 

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