defaults --help (return code: 0)
The 'defaults' command lets you to read and modify a user's defaults. This program replaces the old NeXTstep style dread, dwrite, and dremove programs. If you have access to another user's defaults database, you may include '-u username' before any other options to use that user's database rather than your own. defaults read [ domain [ key] ] read the named default from the specified domain. If no 'key' is given - read all defaults from the domain. If no 'domain' is given - read all defaults from all domains. defaults readkey key read the named default from all domains. defaults write domain key value write 'value' as default 'key' in the specified domain. 'value' must be a property list in single quotes. defaults write domain dictionary write 'dictionary' as a replacement for the specified domain. 'dictionary' must be a property list in single quotes. defaults write reads standard input for defaults in the format produced by 'defaults read' and writes them to the database. defaults delete [ domain [ key] ] remove the specified default(s) from the domain. If no 'key' is given - delete the entire domain. defaults delete read standard input for a series of lines containing pairs of domains and keys for defaults to be deleted. defaults domains lists the domains in the database (one per line) defaults find word searches domain names, default names, and default value strings for those equal to the specified word and lists them on standard output. defaults plist output some information about property lists defaults help list options for the defaults command.