On 6/19/20 7:53 PM, Bryan Henderson wrote:
> I tracked it down to an Ncurses change.
>
> Bash/readline attempts to move the cursor left by calling Ncurses (libtinfo)
> function 'tputs' with ASCII BS (ctl-H) as the argument. The function of
> 'tputs' is to write stuff to the terminal with delays
I tracked it down to an Ncurses change.
Bash/readline attempts to move the cursor left by calling Ncurses (libtinfo)
function 'tputs' with ASCII BS (ctl-H) as the argument. The function of
'tputs' is to write stuff to the terminal with delays added, as required by
early printing terminals.
In
>But I thought of 'strace'. I attached that to the Bash process and
>clearly saw it sending only space characters, no backspaces:
>
>pselect6(1, [0], NULL, NULL, NULL, {[], 8}) = 1 (in [0])
>read(0, "q", 1) = 1
>write(2, " ", 1)= 1
I can reproduce
> Try the xev program. It will show X events and may reveal the keypresses
> you're interested in.
Thanks. The mystery here is on the other side - things received by the
terminal, not keys pressed.
But I thought of 'strace'. I attached that to the Bash process and
clearly saw it sending only
On Thu, Jun 18, 2020, 6:03 PM Bryan Henderson
wrote:
> ...
Any ideas on how I could see
> the raw character stream sent to a terminal?
>
>
Try the xev program. It will show X events and may reveal the keypresses
you're interested in.
>
> When you press Backspace to erase a character, what normally happens is that
> three characters are sent to the terminal: backspace, space, and backspace.
> ...
> Is it possible that your terminal is receiving BS-space-BS and for whatever
> reason, is ignoring/discarding the two BS characters,
On Thu, Jun 18, 2020 at 08:53:57PM +, Bryan Henderson wrote:
> I see this with an X.org xterm under Linux and a Linux virtual console, both
> through SSH (Openssh), and Putty in Windows, via Putty's SSH.
>
> To simplify things, I set my erase key to "q" (stty erase q). ctl-V q
> confirms
> I imagine that depends on your terminal and your stty settings. On MacOS with
> Bash 5 in Terminal.app what you describe doesn't happen for me. What terminal
> are you using? What is the output of stty -a with respect to erase? What do
> you get in that setup when you press Ctrl-V then
On 6/17/20 5:30 PM, bry...@giraffe-data.com wrote:
> Bash Version: 5.0
> Patch Level: 3
> Release Status: release
>
> Description:
>
> With TERM environment variable set to an undefined terminal type, Bash
> echoes a backspace as a space; I expect it to echo as a backspace (ctl-h).
> It
Also, of import in any terminal question is the content of your
prompt (PS1 variable).
See https://mywiki.wooledge.org/BashFAQ/053
On Wed, Jun 17, 2020 at 09:30:25PM +, bry...@giraffe-data.com wrote:
> With TERM environment variable set to an undefined terminal type, Bash
> echoes a backspace as a space; I expect it to echo as a backspace (ctl-h).
> It edits the line properly; it just isn't displayed correctly.
>
On Wed, Jun 17, 2020, 5:07 PM wrote:
> Configuration Information [Automatically generated, do not change]:
> Machine: x86_64
> OS: linux-gnu
> Compiler: gcc
> Compilation CFLAGS: -g -O2
> -fdebug-prefix-map=/build/bash-2bxm7h/bash-5.0=. -fstack-protector-strong
> -Wformat -Werror=format-security
Configuration Information [Automatically generated, do not change]:
Machine: x86_64
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS: -g -O2 -fdebug-prefix-map=/build/bash-2bxm7h/bash-5.0=.
-fstack-protector-strong -Wformat -Werror=format-security -Wall
-Wno-parentheses -Wno-format-security
uname
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