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From: Chet Ramey <chet.ramey@case.edu>
Newsgroups: gnu.bash.bug
Subject: Re: No way to 'bind -x' symbolic character names
Date: Sat, 30 Nov 2019 12:24:03 -0500
Organization: ITS, Case Western Reserve University
Lines: 44
Approved: bug-bash@gnu.org
Message-ID: <mailman.3.1575138610.1979.bug-bash@gnu.org>
References: <1575045558200.80219@kth.se> <CANaoh6K4oSmxRhOsHazus0bwEOz0uqG1GwdwQZjMg5BVufJQFg@mail.gmail.com> <1af94481-adb0-f95e-ced2-ebc301525b85@case.edu>
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Cc: chet.ramey@case.edu, bug-bash <bug-bash@gnu.org>
To: Dennis Williamson <dennistwilliamson@gmail.com>, Nikolaos Kakouros <nkak@kth.se>
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Xref: csiph.com gnu.bash.bug:15681

On 11/30/19 9:57 AM, Dennis Williamson wrote:
> On Fri, Nov 29, 2019, 10:40 AM Nikolaos Kakouros <nkak@kth.se> wrote:
> 
>> Using bash version:
>>
>> GNU bash, version 5.0.11(1)-release (x86_64-pc-linux-gnu)
>>
>>
>> Trying to map Backspace to execute a function, I try to do:
>>
>> bind -x '"Rubout": my_func'
>>
>> This, as expected, binds the string 'Rubout' to the function. Omitting the
>> double quotes makes bind fail. Escaping, like `\Rubout`, works neither.

The answer below, using the standard "\C-?" notation to denote DEL, is the
right one. The symbolic character names were deprecated a number of years
ago. They only work with old APIs.

>> This is important in the case of Backspace, as there is no (to my
>> knowledge) other way to bind the backspace than using Rubout. Using Konsole
>> as my terminal emulator, `C-v Backspace` prints `^?` which I haven't
>> managed to use with bind.
>>
> 
> Backspace is a terminal setting which has precedence. You have to first
> undefine it.
> 
> stty erase undef
> bind -x '"\C-?":my_func'

The `stty erase under' might be overkill, since it affects all programs
using that terminal.

Readline binds the terminal special characters if the variable
`bind-tty-special-chars' is set, and it's set by default. You could unset
that instead of disabling the stty erase character binding.

Chet
-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
		 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU    chet@case.edu    http://tiswww.cwru.edu/~chet/