Explanation of special file permissions in Linux

Article Title: Explanation of special file permissions in Linux. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source.

File special permissions.

-When the rwsr-xr-x = 4755 file is executed, it will be executed as the owner, that is, setuid.

Example:-rwxr-xr-t 1 root wheel 0 7 9 test

This test allows the same group or other people to run, but it can control the files or devices with the root attribute when running.

Let's look at something special. About Directory Security.

# Ls-la/tmp

Drwxrwxrwt 12 root wheel 1536 7 9.

Drwxr-xr-x 17 root wheel 512 6 16 ......

-Rwxr-xr-t 1 root wheel 0 7 9 18:24 test

Please note that

Drwxrwxrwt 12 root wheel 1536 7 9.

Everyone should pay attention to this t. He indicates that drwxrwxrwt = 1777 anyone can have write permission in this directory, but cannot delete files owned by others.