[BRLTTY] Understanding brltty on a linux machine

[Aura Kelloniemi]

Hi!

On 2025-03-20 at 05:21 +0530, "Pranav Lal" <pranav at techesoterica.com> wrote:
 > I have brltty running on my arch linux system. At the bash prompt, if I do
 > Echo test
 > I do not see the word test. However, if I scroll up, then I can read the
 > command in the buffer. 

If you run "echo test", you will of cours see the new command prompt on the
braille display, because the prompt is printed after "test" and because the
screen cursor is located at the end of the prompt. I believe this is clear to
you.

Now, if you use the LNUP (line up) command of BRLTTY, you should see the word
"test" or an empty braille window, if the command prompt was longer than your
braille display. LNUP command does not move the braille window to the left
side of the terminal, it just moves one line up keeping the braille window's
left edge where it was. To get to see the beginning of the line you need to
use FWINLT (full window left), LNBEG (line beginning) or a similar command.

But if scrolling up immediately shows the previous command prompt (and your
echocommand), it could be that you have invoked the PRPROMPT BRLTTY command
(which stands for previous prompt). It scrolls up in the terminal window until
it finds something that looks like a command prompt.

Hopefully this helps.

-- 
Aura