Sudoers

sudo as user _root

Allow members of the group "procksi_admin" to sudo to user "root" with their own password as authentication.

Append the following to the end of /etc/sudoers:

## Allow members of the group "procksi_admin" to su to any user
## having to authenticate themselves with their own password
%procksi_admin localhost,master01=(ALL)     ALL

sudo as user procksi

Allow members of the group "procksi_dev" to sudo to user "procksi" without entering a password

## Allow members of the group "procksi_dev" to su to user "procksi" 
## without having to authenticate themselves
%procksi_dev  localhost,master01=(procksi)  NOPASSWD:ALL

Usage for instance as:

> sudo -u procksi whoami
procksi