How to hide private folder from other users

Assuming you’re following the examples in:

and inserting this line into the /etc/passwd file, then I note that the ‘bill’ example uses 1000:1000

bill:x:1000:1000:,2,,:/shares/:/bin/sh

I’m afraid I’m not familiar enough with the format of the passwd file to advise: I’m sure google will provide an explanation for the required format.