The use of -r in id command.

dE_logics · Advocate Joined: 02 Jan 2009 Posts: 2253 Location: $TERM

With the -r switch id should print the real UID/GID, but running id -ru or -rg with su -c prints the EUID/EGID.

So, what the use of this switch?
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papahuhn · l33t Joined: 06 Sep 2004 Posts: 626

su sets both effective and real UID/GID via setuid(), as it is a suid root binary (man 2 setuid).
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dE_logics · Advocate Joined: 02 Jan 2009 Posts: 2253 Location: $TERM

Oh, ok,. I didn't know anything like that happened.
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