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Another way to check what . and .. in / really is:
.
..
/
% cuonglm at ~ %$ readlink -f .. /home % cuonglm at ~ %$ readlink -f /. / % cuonglm at ~ %$ readlink -f /.. /
As you can see, . and .. is pointed to /.
% cuonglm at ~ % readlink -f .. /home % cuonglm at ~ % readlink -f /. / % cuonglm at ~ % readlink -f /.. /
$ readlink -f .. /home $ readlink -f /. / $ readlink -f /.. /
