I am setting up a new server based on FreeNAS, a FreeBSD-based operating system. The system has a group,
wheel. I have a vague idea that sysadmins should be added to group
wheel, and that the group confers ability to use
su (superuser). However, I can't find this written down anywhere.
What is the purpose of group
wheel? Under what circumstances I should add my users to it? Please also cite FreeBSD documentation which explains this.