The chmod command can change permissions for all subdirectories. Here are 2 methods:
Change permissions for a single file: chmod mode file|dir
Change permissions for all subdirectories: chmod mode dir -R Note the -R parameter added at the end.
The parameter is the permission mode mode = 777 or 752 , 666,,,
The three digits of mode represent the permissions for owner, group, and others respectively.
1 = x execute 2 = w write 4 = r read. For example, if the owner has all permissions, 1+2+4=7,
Or if the group has read and execute permissions, 1+4 = 5
Change the owner to wang and the group to users for the directory /his and all files and subdirectories under it.
$ chown – R wang.users /his