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The purpose of this article is to share with you about how to modify file permissions on CVM. The editor thinks it is very practical, so I hope you can learn something after reading this article. Let's take a look at it with the editor.

How do I modify file permissions on a CVM? File permissions are very important to a server system. Each file has set access rights for different users. You can manually modify the access rights of files through the chmod command.

The chmod command can use numbers to modify file permissions

In the Linux system of CVM, the basic permissions of files are composed of 9 characters. Taking rwxrw-r-x as an example, we can use numbers to represent each permission. The corresponding relationship between each permission and number is as follows:

R-- > 4w-- > 2x-- > 1

Because these nine characters belong to three types of users, each user identity contains three permissions (r, w, x). By adding the numbers corresponding to the three permissions, the final value can be used as the permissions of each user.

In the case of rwxrw-r-x, the right limits for owners, groups, and others are:

Owner = rwx = 4 "2" 1 = 7 Group = rw- = 4 "2 = 6 others = rmurx = 4" 1 = 5

Therefore, the corresponding permission value for this permission is 765.

The basic format of the chmod command to modify file permissions using numbers is:

[root@localhost ~] # chmod [- R] permission value file name

The-R (uppercase) option means that all files in the subdirectory also modify the set permissions.

For example, you can modify the permissions of the .bashrc directory file by using the following command:

[root@localhost] # ls-al .bashrc-rw-r--r--. 1 root root 176Sep 22 2004. Bashrc [root@localhost] # chmod 777. Bashrc [root@localhost] # ls-al. Bashrc-rwxrwxrwx. 1 root root 176 Sep 22 2004 .bashrc or above is how to modify file permissions on CVM. The editor believes that there are some knowledge points that we may see or use in our daily work. I hope you can learn more from this article. For more details, please follow the industry information channel.

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