Linux Command-based chmod usage and linuxchmod usage

Linux Command-based chmod usage and linuxchmod usage

Chmod: Change permissions

Method 1:Use a number to change the permissions of a file or path

The permission score is as follows:

R: 4

W: 2

X: 1

Identity includes:

User: u, group: g, other: o

For example,-rwxrwx --- indicates that the file permissions are:

User: 4 + 2 + 1 = 7

Group: 4 + 2 + 1 = 7

Other: 0 + 0 + 0 = 0

Note: In this case, drwxrwx ---, the first letter is d, indicating a path, with the same permissions as above

Change the File Permission to-rwxr-xr-x.

Chmod 755 file

NOTE: If it is a directory, the code is: chmod 755 dir; if all the contents are 755, then: chmod 755-R dir

Method 2:Use the symbol type to change File Permissions

User: u + (ADD) r

Group: g-(remove) w files or directories

Other: o = (SET) x

All:

Chmod a + x file adds execution permissions to u, g, and o

Chmod u-w file removes write permission from u

You can also use this method: chmod u = rwx, go = rx file is equivalent to chmod 755 file