Info Catalog coreutils: Setting Permissions coreutils: Symbolic Modes coreutils: Changing Special Mode Bits

coreutils: Copying Permissions

 
 27.2.2 Copying Existing Permissions
 -----------------------------------
 
 You can base a file’s permissions on its existing permissions.  To do
 this, instead of using a series of ‘r’, ‘w’, or ‘x’ letters after the
 operator, you use the letter ‘u’, ‘g’, or ‘o’.  For example, the mode
 
      o+g
 
 adds the permissions for users who are in a file’s group to the
 permissions that other users have for the file.  Thus, if the file
 started out as mode 664 (‘rw-rw-r--’), the above mode would change it to
 mode 666 (‘rw-rw-rw-’).  If the file had started out as mode 741
 (‘rwxr----x’), the above mode would change it to mode 745 (‘rwxr--r-x’).
 The ‘-’ and ‘=’ operations work analogously.
 

Info Catalog coreutils: Setting Permissions coreutils: Symbolic Modes coreutils: Changing Special Mode Bits