Users and Groups in Linux : Create, List, Add, Edit, Assign, and Delete

How to Create, List, Add, Edit, Assign and change user groups, and Delete Users and Groups in Linux

Commands used:

1. list users
- show current user
#users
- list all users
#cat /etc/passwd -or- #getent passwd

2. list groups
- show groups for current user
#groups
- show groups for a user
#groups username
- list all groups
#cat /etc/group -or- #getent group

3. Create a New User
- Create a New User
#useradd username
this command will create user and a group will also created for the new user with the same name
- Create a New User and Assign a Group in one command
#useradd -G groupname username
-or-
#useradd -G group1,group2,group3 username

4. change user password or set password for the new user
- #passwd username

5. add new group
- #groupadd newgroup

6. Add existing User to a Group
- add a User to a Group
#usermod -a -G group username
- add a User to Multiple Groups
#usermod -a -G group1,group2,group3 username

7. Removing user from group
- #gpasswd -d username group

8. Change User Primary Group
- #usermod -g group user
Note: -g lowercase to assign user primary group

9. delete groups
- #groupdel groupname

10. delete user
- #userdel username
- #userdel -r username
Note: -r option to remove user's home directory and the user's mail spool

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