Special user permissions for files

The second book

two。 List of user permissions

1. Definition of permission list

A record table that specifies that a special user has special permissions on a file

two。 Identification of permission list

-rw-rw-r--. The permission bit has a plus sign and the permission list is open.

-the rw-r--r--+ permission is Yes. , permission bit is off

3. View of permission list

Getfacl file

# file: name of the file# file

# owner of owner:root# file

# all groups of group:root# files

User:rw-# file owner permissions

User:test:rw-# special user specified permissions

Group:r--# group permissions

Mask:rw-# permission threshold

Other:r--# other permissions

4. How to set the acl list

Setfacl-m u:username: permission filename

Setfacl-m u:test:rw / mnt/file# specifies that test users can read and write file files

Setfacl-x u:student file# removes student user information from the list

Setfacl-x g:student file# removes student group information from the list

Setfacl-b file # close the list

5.mask permission threshold

If you chmod a file with a permission list, it is likely to modify the mask in the file permission list

Mask is the maximum permission value that a special user can get.

Setfacl-m m: permission filename # to modify the value of the mask

6. Default permissions

Set when we need to create a new file or directory in the specified directory with special permissions for the specified user

Setfacl-m d:u:username: permission filename

The default permissions do not take effect on existing files or on the directory itself

# # Kernel automatic execution cancels x execution permissions of files

# # default has a default effect on the permissions of directories under the directory. First, inherit the default permissions.