am a new Ubuntu Linux 16.04.xx LTS server user. How do I create a new sudo user on my server? How do I add a new user as sudoer file using the command line option on Ubuntu?
ow do I add a user to group under Ubuntu Linux operating system using command line options?
How do I deny access to user account? Do I need to use /bin/false or /sbin/nologin to refuse a login?