Linux modify file and directory permissions method

Syntax: chown [options] User or group file

Description: Chown changes the owner of the specified file to the specified user or group. The user can be a user name or a user ID. A group can be either a group name or a group ID. The file is a space-separated list of files that you want to change permissions for, wildcard characters are supported.

The chmod command can change permissions for all subdirectories:

To change the permissions of a file:

The code is as follows	Copy Code
chmod mode File|dir

To change permissions for all subdirectories:

The code is as follows	Copy Code
chmod mode Dir-r

Note that the-R parameter is appended

For example, change all files under File directory to 777:

The code is as follows	Copy Code
chmod 777 File-r

To modify the permissions for all files in a directory at once, including file permissions in subdirectories, use the parameter-R representation to initiate recursive processing.

For example:

The code is as follows	Copy Code
[Root@localhost ~]# chmod 777/home/user Note: Only the permissions for the/home/user directory are set to RWXRWXRWX [Root@localhost ~]# chmod-r 777/home/user Note: Sets the permissions for the entire/home/user directory and the files and subdirectories therein to rwxrwxrwx

To modify the permissions for all files in a directory at once, including file permissions in subdirectories, use the parameter-R representation to initiate recursive processing.

For example:

The code is as follows	Copy Code
[Root@localhost ~]# chmod 777/home/user Note: Only the permissions for the/home/user directory are set to RWXRWXRWX [Root@localhost ~]# chmod-r 777/home/user Note: Sets the permissions for the entire/home/user directory and the files and subdirectories therein to rwxrwxrwx

View Directory Permissions

Statement to view file permissions:
In the terminal input:
Ls-l xxx.xxx (xxx.xxx is file name)
Then there will be similar messages, mostly these:
-rw-rw-r--
A total of 10 digits
Which: the front one-represents the type
The middle one of the three rw-represents the owner (user)
Then the three rw-represent groups (group)
The last three r--represent other people (other)
And then I'll explain the 9 digits in the back:
R indicates that the file can be read (read)
W indicates that the file can be written (write)
x indicates that the file can be executed (if it is a program)
-Indicates that the appropriate permissions have not been granted
Now it's time to talk about modifying file permissions.
In the terminal input:
chmod o W xxx.xxx
To give other people permission to write xxx.xxx this file
chmod GO-RW xxx.xxx
Indicates deletion of Read and write permissions for groups and other people in xxx.xxx
which
U on behalf of owner (user)
G represents the group in which the owner is located
O on behalf of others, but not u and g (Other)
A represents all the people, including U,g and O.
R indicates that the file can be read (read)
W indicates that the file can be written (write)
x indicates that the file can be executed (if it is a program)
Where: Rwx can also use numbers to replace
R------------4
W-----------2
X------------1
-------------0
Let's go:
Represents adding permissions
-Indicates delete permission
= means to make it a unique permission
When everyone is aware of the above, then some of our common permissions are easy to understand:
-RW-------(600) Only the owner has read and write permission
-rw-r--r--(644) Only the owner has read and write permission, the group and others only Read permission
-RWX------(700) Only the owner has access to read, write, execute
-rwxr-xr-x (755) Only the owner has the right to read, write, execute, group and others only read and execute
-rwx--x--x (711) Only the owner has permission to read, write, execute, group and others only execute
-rw-rw-rw-(666) Everyone has access to read and write
-RWXRWXRWX (777) Everyone has access to read and write and execute