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Bash sets PS1 and $- includes i if the shell is interactive, so a
shell script or a startup file can test this state
from the top result below
https://www.man7.org/linux/man-pages/man1/bash.1.html?ref=sfeir.dev
Bash sets PS1 and $- includes i if the shell is interactive, so a
shell script or a startup file can test this state