Module 16 - Creating Users and Groups

Module 16 Creating Users and Groups Exam Objective 5.2 Create Users and Groups Objective Description Creating users and groups on a new system. Introduction Introduction Remember: User account info and authentication info is stored in the /etc/passwd and /etc/shadow files. Using these files...

Module 16 Creating Users and Groups Exam Objective 5.2 Create Users and Groups Objective Description Creating users and groups on a new system. Introduction Introduction Remember: User account info and authentication info is stored in the /etc/passwd and /etc/shadow files. Using these files to add users/groups is possible but not recommended. Using commands is more appropriate. When creating a new users, some distributions create a User Private Group (UPG). Note: Before you begin creating users, you should plan how you will use groups. Creating Groups Groups Groups provide a way for users to share files. When creating a group, the grep command can be used to verify configuration and changes. The getent command can be used to show local and network-based groups. root@localhost:~# grep root /etc/group root:x:0: root@localhost:~# getent group root root:x:0: Creating a Group Execute the groupadd command by root user to create a new group. To specify a group ID (GID) for the group, use the -g option. root@localhost:~# groupadd -g 506 research If -g option is not used, groupadd will automatically assign a GID one value higher than the last added in /etc/group file. root@localhost:~# grep research /etc/group research:x:506: root@localhost:~# groupadd development root@localhost:~# grep development /etc/group development:x:507: Group ID Considerations Remember: In some distributions, when a user ID is created a UPG is also created. Avoid creating GIDs in the same range as UIDs created in the future. GIDs under 1000 are reserved for system use. To bypass this and assign a