1. query file (or directory) permissions
Querying file permissions, using the command: Ls-l file name
Query folder permissions, using the command: LS-LD directory name
For example:
The first character specifies the file type (if the first character is a horizontal line, it is a non-directory file; if it is D, it is a directory,
The second paragraph is the property of the owner of the file,
The third paragraph is the attribute of the group to which the file belongs.
The fourth paragraph is a property for other users.
2. Modify the file (or directory) permissions
Command form: chmod-(representative type) XXX file (or directory) name
For example:
Each of the three-digit digits represents a user-type permission setting. The value is 0~7, which is the binary [000]~[111]. Each of the three-bit binary digits represents the read, write,
Row permissions.
3. Modify a user group that changes a file or directory
Command form: CHGRP [options] group filename
For example:
Parameter:-R means to recursively change the genus of the specified directory and all subdirectories and files under it.
4. Modify the user or group to which a file or directory belongs
Command form: chown [options] User or group file
For example:
Ubuntu modify file or directory permissions
