Linux file permissions

The meaning of rwx used by Linux:

R indicates read permission with a score of 4;

W indicates write permission with a score of 2;

X is the execution permission, the score is 1;

With the combination of 4, 2, and 1, several permissions can be obtained:

0: no permission;

4: Read permission;

5:4+1, read + Execute permission;

6:4+2, read + Write access;

7:4+2+1, read + Write + Execute permissions;

For example:

444 r--r--r--

RW-------

644 rw-r--r--

666 rw-rw-rw-

RWX------

744 rwxr--r--

755 Rwxr-xr-x

777 Rwxrwxrwx

From left to right, 1-3 digits represent the permissions of the file owner, 4-6 digits represent the permissions of the same group of users, and 7-9 numbers represent the permissions of the other user.

Linux file permissions