This article to show you some commands that are usually used to moderate user and group in Ubuntu.
Create new user with home directory:
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useradd -m -p `mkpasswd [password]` -s /bin/bash [username] |
Remove user with related files:
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userdel -r [username] |
Show groups of user:
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sudo groups [user_name] |
Or
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id -gG www-data |
And supplementary group to user:
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sudo usermod -a -G [group_name] [user_name] |
Change user default groups:
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sudo usermod -g [group_name] [user_name] |