default settings for the adduser comman /etc/adduser.conf

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You can also configure various default settings for the adduser command. A configuration file /etc/adduser.conf can be used to set the default values to be used by the adduser, addgroup, and deluser commands. A key value pair of configuration can set various default values, including the home directory location, directory structure skel to be used, default groups for new users, and so on. Check the manual page for more details on adduser.conf with following command:

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