Linux system permission settings: the mysterious power behind access cards

We know that you need to properly set folder permissions in the Linux operating system to ensure security. This is like using an access card to control access, tightly restricting a user's access to the corresponding area. Next, we will explain in detail how to achieve effective file and data security management by comparing the effects of various actual permission settings.

1. Super user (root) permissions:

As a distinguished Linux system administrator, you are like a super user (root) with mysterious power. You can modify, edit, delete or even copy various files and folders in the system at will without cumbersome authorization. Often, just using the concise and easy-to-understand chmod command, you can cleverly set the access permissions they need while respecting the rights of others.

2. Owner permissions:

Please note that the owner of the folder is its creator! In order to better manage these permissions, you can use the chmod command to adjust them appropriately. Normally, as the owner, it is recommended to grant yourself three basic permissions: read (r), write (w) and execute (x).

3.Group permissions:

Do you know? In the Linux system, each user can be added to one or more groups! The purpose of this is to help you better manage the activities of many users. By using a simple command - chmod, you can give various permissions to the friends you manage, such as only allowing them to read (r) or modify and write (rw) to a certain folder. This is a good and convenient way to operate!

4. Other user permissions:

When dealing with people other than non-administrators and memberslinux sets folder permissions to all users, we collectively call them other users. In this process, make full use of the advantages of the chmod command to grant appropriate access rights and operation permissions. In order to ensure the security of documents and data, we recommend you to reduce the permission settings of other users.

5. Permission example:

The following are some common folder permission setting examples:

- rwxrwxrwx: All users have read, write and execute permissions.

This sentence clearly points out a permission setting, that is, "rwxr-x---" modelinux sets folder permissions to all users, this setting means that the owner of the file has the right to Full read, write and execute capabilities; but for group members, only read and execute permissions are available; other users have no rights to approach it.

-Only the owner has read, write and execution rights, and no one else has.

6. Steps to set folder permissions:

In Linux systems, you can set the permissions of folders through the following steps:

1) Use the ls -l command to check the permissions of the current folder;

2) Use the chmod command to modify the permissions of the folder as needed;

3) Use the ls -l command again to verify whether the new permissions of the folder take effect.

7. Notes:

Please note that you should set folder permissions appropriately to prevent unnecessary permissions being granted. Additionally, it is critical to review and adjust permissions regularly to maintain the security of your entire system and data. Thank you for your cooperation!

Here is a brief analysis of the characteristics of various folder permissions, including super users, owners, members, and ordinary users such as guests. At the same time, two practical examples and specific operation steps are shared in the Linux forum to help you understand and protect file and data security more deeply. It is hoped that through orderly folder permission settings, the stability and reliability of the entire system can be improved.

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