X Window 사용 권한 설정 user group 변경하는 명령

 freebsd handbook 에 잘 나와 있다. 

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https://docs.freebsd.org/en/books/handbook/x11/#x-install

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The current user must be a member of the video group. To add a user to video group, execute the following command:

# pw groupmod video -m username

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이것은 debian 계열 OS에서의 su 및 sudo 사용권한을 사용자의 계정 및 group 설정에 의해 제어하도록 하는 것과 비슷한 것 같다.

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참고:

https://www.redhat.com/en/blog/linux-groups

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_( 구글검색:    group add in linux   )_ 또는 _( 구글검색:   group add in freebsd  )_

-  _( 구글 AI:   group add in linux   )_

To create a new group in Linux, use the groupadd command followed by the group name. For example, sudo groupadd mygroup creates a group named "mygroup". To verify the group was created, you can check the /etc/group file or use the getent group mygroup command. 

Here's a more detailed explanation: 

1. Open a terminal: Launch a terminal on your Linux system.
2. Use the groupadd command: To create a new group, use the following syntax:

코드

   sudo groupadd <group_name>

Replace <group_name> with the desired name for your new group. The sudo command is needed because you need administrative privileges to create a group. 

1. Verify the creation: You can verify the creation by:
   • Checking /etc/group: This file contains information about all groups on the system. You can use the cat /etc/group or grep <group_name> /etc/group command to view it.
   • Using getent group: The getent group <group_name> command will display the group's information, including its members, if any.

Example:

To create a group named "developers", you would use the command: 

코드

sudo groupadd developers

Explanation:

• groupadd: This is the command to create a new group.
• sudo: This command is used to execute the command with administrative privileges, which are required to modify system files like /etc/group.
• <group_name>: This is the name you want to give to the new group. 

Additional notes:

• You can also specify a group ID using the -g option: sudo groupadd -g <group_id> <group_name>. 
• To add a user to a group, you can use the usermod command: sudo usermod -aG <group_name> <user_name>. 
• To remove a user from a group, you can use the usermod command: sudo usermod -G <new_groups> <user_name>. This will replace the user's existing supplementary groups with the new list. 
• To list the groups a user is a member of, use the id or groups command. 

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