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Date: Wed, 24 Mar 2010 08:29:41 +0800
From: Aiza <aiza21@comclark.com>
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Subject: delete directory
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This directory named empty has read/exec permissions.
How do I delete it?

# /usr/jails/newjail/var >ls -l
total 2
dr-xr-xr-x  2 root  wheel  512 Nov 21 22:53 empty
# /usr/jails/newjail/var >cd empty
# /usr/jails/newjail/var/empty >ls -l
total 0
# /usr/jails/newjail/var/empty >cd ..
# /usr/jails/newjail/var >rmdir empty
rmdir: empty: Operation not permitted
# /usr/jails/newjail/var >rm -rf empty
rm: empty: Operation not permitted
# /usr/jails/newjail/var >chmod 777 empty
chmod: empty: Operation not permitted