Suppose a directory dir1 is created by sudo on Desktop.

sudo mkdir dir1

Then I applied chown and chmod as following:

sudo chown root:root dir1

sudo chmod go-rwx dir1

Now dir1 is only accessible with owner root.

$ ls -ld dir1

drwx------ 2 root root 4096 Jul 29 19:21 dir1

If user ($USER = pandya) try to delete dir1 with GUI nautilus (without sudo), then he can't which is ok.

But if tried to remove with terminal then he can which is not ok:-

• rm -r (without sudo):

  
  
  

   $ rm -r dir1
  
   rm: descend into write-protected directory ‘dir1’? Y
  
   rm: remove write-protected directory ‘dir1’? Y
  
   $
  
  




• And more easily with rmdir ! (without sudo):

  
  
  

  $ rmdir dir1
  
  $ 
  
  

Thus, How to prevent dir1 to be delete with user than not sudo?

[optional]

My ultimate aim is: Only owner can delete directory, group and other only can read/execute.