Debian 10 Buster
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Initial Settings : Add New Users
2019/07/10
[1] If you'd like to add new users, Add like follows.
# add a user [buster]

root@dlp:~#
adduser buster

Adding user `buster' ...
Adding new group `buster' (1001) ...
Adding new user `buster' (1001) with group `buster' ...
Creating home directory `/home/buster' ...
Copying files from `/etc/skel' ...
New password:            # set user's password
Retype new password:     # confirm
passwd: password updated successfully
Changing the user information for buster
Enter the new value, or press ENTER for the default
        Full Name []:    # input some informations (or possible to keep empty)
        Room Number []:
        Work Phone []:
        Home Phone []:
        Other []:
Is the information correct? [Y/n] y
root@dlp:~#
[2] If you'd like to limit users to switch to root user account, configure like follows.
For example, Configure that only [buster] user can switch to root account with [su] command.
root@dlp:~#
usermod -G adm buster

root@dlp:~#
vi /etc/pam.d/su
# line 15: uncomment and add the group

auth       required   pam_wheel.so group=adm
[3] If you'd like to remove user accounts, Configure like follows.
# remove a user [buster] (only removed user account)

ubuntu@dlp:~$
deluser buster
# remove a user [buster] (removed user account and his home directory)

ubuntu@dlp:~$
deluser buster --remove-home
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