To add user to a group
useradd -g group user
id user
To cause all future folders and files created in /samba/founders to be owned by the “founders” group, do the following
chgrp founders /samba/founders && chmod g+s /samba/founders
Change permissions in all sub folders and files
chmod -R 755 directory-name/
read = 4
write = 2
execute = 1
so:
r– = 4
rw- = 6
rwx = 7