sudo, sudoedit — execute a command as another user

shell> visudo
shell> vi /etc/sudoers

# Allow members of group sudo to execute any command
%sudo   ALL=(ALL:ALL) ALL

# Uncomment to allow members of group sudo to not need a password
%sudo ALL=NOPASSWD: ALL

shell> groupadd sudo
shell> usermod -G sudo <username>
shell> sudo su -

shell> sudo -H -s
shell> sudo -K

sudo: unable to resolve host