Linux in Chown, chmod, chgrp

1, CHGRP (change the file belongs to the user group)

CHGRP (transform file to user group) change Group

CHGRP user Group filename # # #便是这个格了. If the entire contents are changed, the plus-r parameter is used for recursion.

Example: Chgrp-r user smb.conf

2. Chown (change file owner)

Format: chown-r-H User name file/Catalog

The-r option represents the same operation for files in all subdirectories, and the-h option means that the target file that the link points to is not affected when the owner of the symbolic link file is changed.

Note: Once ownership of a file is given to another user, it is no longer possible to reclaim its ownership and ultimately only to the system administrator.

Chown User name: User group: File/Catalog

If the entire contents are changed, the plus-r parameter is used for recursion.

Example: Chown-r root/etc/config.cfg

Chown-r Root:root/home

3, chmod (change file attributes)

+ hint add permission,-hint to dismiss permission, = imply only set permission.

R implies readable, W implies writable, X implies can be implemented, x implies that only if the file is a subdirectory, presumably the file has been set up for implementation.

--version: Performance version

By letter notation

Example 1: Set the file file1.txt to be read by all people:

chmod ugo+r File1.txt

U (user) represents the current user, the first three-bit 2-4-bit

G (group) represents the group in which the second three-bit 5-7-bit

O (Other) on behalf of the other, in the third three-bit 8-10-bit

Example 2: Set the file file1.txt to be read by all people:

chmod a+r File1.txt

In numerical notation

Permissions for User, Group, and other.

R W X

-   - - -   - - -   - - -

111 111 111

The decimal that each digit represents by using the binary algorithm

R=4,w=2,x=1

To rwx the attribute then 4+2+1=7;

To rw-the attribute then 4+2=6;

To r-x the property, 4+1=5.

　　

Linux in Chown, chmod, chgrp