This is the command attr_back_group that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator
rsbac-admin - Rule Set Based Access Control
rsbac-admin is a set of tool used to manage systems using a Rule Set Based Access Control
See http://www.rsbac.org/documentation for documentation.
Use attr_back_group online using onworks.net services