Some shells indeed seem to not set PS1 for non-interactive shells. However, it seems bad to rely on this to detect non-interactive shells. I don't see language in POSIX that says PS1 should not be set for non-interactive shells. Some people export PS1 in their shell startup files, breaking the check. The correct way to detect interactive vs non-interactive shells is to check if $- contains "i", for example:
case $- in *i*) echo I am interactive ;; *) echo I am not interactive ;; esac -- Jilles Tjoelker -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
