Add -g group to usage message. Don't treat pointer as a boolean, but instead test it against NULL. Add warning for groups that don't exist
Add -g group to usage message.
Don't treat pointer as a boolean, but instead test it against NULL.
Add warning for groups that don't exist

Submitted by: ru

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase