@hanno Here are a few other examples of disappearing text, the resulting effect depends on the terminal emulator you use. Here on xfce4-terminal (and bash):
$ echo -e "blabla\033\0135blibli\n\n\n" | hexdump -C
00000000 62 6c 61 62 6c 61 1b 5d 62 6c 69 62 6c 69 0a 0a |blabla.]blibli..|
00000010 0a 0a |..|
00000012
$ echo -e "blabla\033\0135blibli\n\n\n"
blabla$ echo -e "blabla\033\0135blibli\n\n\n" | grep bli
blabla$
$
$ echo -e "blabla\n\033\0135blibli\n\n\n" | hexdump -C
00000000 62 6c 61 62 6c 61 0a 1b 5d 62 6c 69 62 6c 69 0a |blabla..]blibli.|
00000010 0a 0a 0a |...|
00000013
$ echo -e "blabla\n\033\0135blibli\n\n\n"
blabla
$ echo -e "blabla\n\033\0135blibli\n\n\n" | grep bli
$
$ echo -e "blabla\033\0135\nblibli\n\n\n" | hexdump -C
00000000 62 6c 61 62 6c 61 1b 5d 0a 62 6c 69 62 6c 69 0a |blabla.].blibli.|
00000010 0a 0a 0a |...|
00000013
$ echo -e "blabla\033\0135\nblibli\n\n\n"
blabla$ echo -e "blabla\033\0135\nblibli\n\n\n" | grep bli
blibli
$
$ echo -e "blabla\033\n\0135blibli\n\n\n" | hexdump -C
00000000 62 6c 61 62 6c 61 1b 0a 5d 62 6c 69 62 6c 69 0a |blabla..]blibli.|
00000010 0a 0a 0a |...|
00000013
$ echo -e "blabla\033\n\0135blibli\n\n\n"
blabla
$ echo -e "blabla\033\n\0135blibli\n\n\n" | grep bli
]blibli
$
That's the trick I used for https://github.com/fuxx/GPG-ANSI-Art-Injector/blob/main/designs/fake_key_summary.py and https://codeberg.org/wllm-rbnt/hacklu-2025-CLI-ambush/