-*- mode: outline; coding: utf-8 -*-

* Stop sudo asking for password.

  username ALL =(ALL) NOPASSWD: ALL

or

  @group ALL =(ALL) NOPASSWD: ALL

* Change user/primary group for executed command.

  $ sudo -u $user -g $group $command

To allow this plase in /etc/sudoers:

  username ALL =(ALL:ALL) NOPASSWD: ALL