Raspberry Pi_Eng_12.7.6 “delgroup” Command – Delete User Group

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12.7.6 “delgroup” Command – Delete User Group

You will need to delete user groups that are not needed on your system. When deleting a user group, be careful about the user accounts belonging to that group.

When deleting a user group, you can use “delgroup” and “groupdel” commands. The “delgroup” command makes it easy to create user groups. On the other hand, the “groupdel” command can handle relatively detailed processing with very low-level commands, but it is not used for general purposes because it is complex to use.

Raspberry Pi_Eng_12.7.5 “addgroup” Command – Create User Group

Posted on by realomega

12.7.5 “addgroup” Command – Create User Group

You can use “addgroup” and “groupadd” commands to create user groups. The “addgroup” command makes it easy to create user groups. On the other hand, the “groupadd” command can handle relatively detailed processing with very low-level commands, but it is complex to use and is not used for general purposes.

Raspberry Pi_Eng_12.7.4 Managing Relationship between User and User Group

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12.7.4 Managing Relationship between User and User Group

Raspberry Pi uses several ways to manage the relationship between user groups and users.

If the user account is not assigned to a separate group, but is assigned only to its own self group, the primary group, the relationship is defined using “/etc/passwd” file.

Raspberry Pi_Eng_12.7.2 Relationship between User and User Group

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12.7.2 Relationship between User and User Group

In the Raspberry Pi system, certain user account is always assigned to a specific group. Also, certain user account can belong to more than one group at the same time.

If you do not specify a separate group for a specific user account, the user always belongs to the primary group, which is its own group. This primary group has the same name as its own user account, contains its own user account only, and is created automatically even if you do not create it separately.

Raspberry Pi_Eng_12.7.1 What is User Group?

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12.7 User Group

12.7.1 What is User Group?

In Linux systems, the concept of group is used to distinguish and manage group of users who can handle certain range of tasks in the system. If you distinguish responsibilities and privileges that can handle a certain range of tasks define and manage them as a group, the same responsibilities and privileges apply to all user accounts belonging to that group. Thus you need not to assign responsibilities and privileges one by one for each individual user account, and it is possible to manage them at once by group

Raspberry Pi_Eng_12.6.2 Changing User Password

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12.6.2 Changing User Password

12.6.2.1 Overview of Changing User Password

User password is the most basic means of keeping your system from external threats. Therefore, it is an important task of system management to give appropriate passwords and to manage them well.

Raspberry Pi_Eng_12.6.1 “usermod” Command – Change User

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12.6 User Change

After the user account is created on the system, there may be a case where the contents of various items defined for the user account need to be changed.

12.6.1 “usermod” Command – Change User

You can use the “usermod” command to change all defined contents of a user account.

Raspberry Pi_Eng_12.5 “deluser” Command – Delete User

Posted on by realomega

12.5 “deluser” Command – Delete User

You need to delete user account that is not needed on your system.

When deleting a user account, you can use “deluser” and “userdel” commands. The “deluser” command makes it easy to create user account. On the other hand, the “userdel” command can handle relatively detailed processing with very low-level commands, but it is complex to use and is not well used for general purposes.

Raspberry Pi_Eng_12.4.3 “adduser” Command – Create User

Posted on by realomega

12.4.3 “adduser” Command – Create User

You can use “adduser” and “useradd” commands to create user accounts. The “adduser” command makes it easy to create user accounts. The “useradd” command can handle relatively detailed processing with very low-level commands, but it is complex to use and generally not used for general purposes.