(main): New argument -d, for specifying directory. (usage): Document. (get_user_id): Compute (get_home_dir): Deleted. (get_prefix): New function, taken from main. (main): Check whether or not we are running setuid. Move prefix computation to get_prefix. Don't call getpwent; we don't need to any more. Instead, move it to get_user_id().
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