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This article uses easy-to-understand examples to introduce the use of chmod commands in linux, the code is very detailed, interested friends can refer to, hope to be helpful.

Chmod introduction:

The command chmod can be used in linux to grant permissions to files or directories. Linux/Unix 's access to files is divided into three levels: file owners, groups, and others. Chmod can be used to control how files are accessed by others.

Permissions: all users

Format: chmod [- cfvR] [--help] [--version] mode file...

Parameter description:

Mode: permission setting string, in the following format: [ugoa...] [[+-=] [rwxX]...] [,...], where u indicates the owner of the file, g indicates that the owner belongs to the same group (group) as the owner of the file, o indicates other people, and an indicates all three.

+ means to increase permissions,-to cancel permissions, and = to set permissions uniquely.

R indicates readable, w indicates writable, x indicates executable, and X indicates only if the file is a subdirectory or if the file has been set to executable.

-s: set the process owner or group ID as the file owner of the file when the file is executed.

-c: if the permission of the file has indeed been changed, the change action will be displayed.

-f: do not display an error message if the file permissions cannot be changed

-v: displays the details of permission changes

-R: make the same permission changes for all files in the current directory as well as subdirectories (that is, change them one by one recursively)

-- help: displays auxiliary instructions

-- version: display version

The usage of chmod is:

1. First open the programming interface and view the permission information of the files in the dog directory.

2. Currently, the user permission of b.txt is RW, the group permission is RW, and the other permissions are R. Now I give the user permission to add X run rights.

3. The same method adds running permissions to groups and other code using chmod u/g/o + x b.txt.

4. If you want to cancel the corresponding permissions, use the "-" sign.

5. In addition to being represented by numbers after using RWX characters, Renew4 Wrang2 Xhammer 1 Magnechmod 777 b.txt adds 3 permissions to all permissions.

6. Renew4, Word2, Xbox 1, 7 minutes, 7 minutes, 6 minutes, etc. If you use data to set permissions, you need to calculate. It is better to understand with characters, and it will be faster to use numbers if you are familiar with it. And all three numbers must be written down.

On the use of chmod commands in linux to share here, I hope that the above content can be of some help to you, can learn more knowledge. If you think the article is good, you can share it for more people to see.

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