Strange behaviour with ansi sequence

[J'aitreschaud]

Bonjour everyone. I recently found out bout ansi escape sequences and I found this strange behaviour.
I have this code:

Code: Select all

@echo off
for /f %%A in ('echo prompt $E^| cmd') do set "ESC=%%A"
echo %ESC%[100m
pause

It should make the background grey. However, it seems like only the text's background is grey.

ansi.png (4.68 KiB) Viewed 4351 times

What's more strange is that after inserting a CLS after the sequence, the whole background turns grey (expected behaviour)

ansi.png (4.62 KiB) Viewed 4351 times

Why is that? Another strange thing is that I can't seem to replicate the behavior after opening the file; I can't revert it back to black with "only grey background only letters" after I clear the screen. Is there an explanation on why this happens?

[jeb]

Hi J'aitreschaud,

ESC[ <n> m is the Select Graphic Rendition sequence, it sets the display attributes, they affect each NEW character that will be written, that's all.
In your case, it changes the complete background after the cls, as the complete screen will be filled with spaces.
To reset that setting, you can use

Code: Select all

REM Reset display attributes
echo %ESC%[0m

REM Clear screen, move cursor to home position
echo %ESC%[2J

jeb

[IcarusLives]

ECHO is providing CRLF so use this instead.

Code: Select all

<nul set /p "=%esc%[100m"

[J'aitreschaud]

@IcarusLives @jeb
Thank you both for your answers.
Also IcarusLives, I love your username; great reference.