In Slack 13.37 it seems su ignores /etc/suath. I added:
but even after logout I am able to su into root account as an ordinary user.
I tried
AlienBOB's (0600), and
arniekat's (0440) recommended permissions, but it doesn't seem to have anything to do with that.
I know there is SU_WHEEL_ONLY option in /etc/login.defs, but I already wrote a full page tutorial based on AlienBOB's and arniekat's articles.
Is /etc/suath depreciated or what (no man page either in Slack 13.37)?
What is the alternative (beside sudo and /etc/login.defs option)?