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

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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

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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.

Raspberry Pi_Eng_12.4.2 Necessary Considerations for Creating User

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12.4.2 Necessary Considerations for Creating User

There are several things to consider when creating a new user account. When creating a user account, the basic management items to be checked are as follows:

■ Items about passwords

■ Items about user groups

Raspberry Pi_Eng_12.4.1 Necessity for Creating User

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12.4 Creating User

12.4.1 Necessity for Creating User

The Raspberry Pi system provides user accounts “pi” and “root” by default, but these user accounts are defined to be used by system administrators or system operators for system management purposes. They are are not suitable for use of normal user other than system administrators or system operators. There may be also several system administrators and system operators, not just one person, and there are cases in which responsibility and authority are separated according to their respective duties. Therefore, a newly created user is necessary for these users to access the Raspberry Pi system. These user accounts are created by system administrators with super user privileges, and are created by restricting the operations or privileges that can be used to suit the tasks of users who use the user accounts.

Raspberry Pi_Eng_12.2.2 Working user

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12.2.2 Working user

12.2.2.1 Meaning or Working user

The working user is the User ID used for the current work. Typically, the logon user is the working user, but in some cases you can use a different user ID to process the work. For example, if the logon user is “pi”, you can use the “root” user account instead of the “pi” user account to perform the tasks that require the root account.