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# apt-get install acl
# init 6
Select 4 in Loader menu
# tunefs -a enable /dev/ad0s1a
<Ctrl-D>
# cat /etc/fstab
... /dev/ad0s1a / ufs rw,acls 1 1 ...
# init 6
# getfacl /etc/passwd # setfacl -m "user:nobody:---" /etc/passwd # setfacl -x "user:nobody:" /etc/passwd