Various LLMs tell me that Mac OS X used to use User Private Groups https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/5/html/deployment_guide/s1-users-groups-private-groups

While this does ring a bell for me, I can't find any links to confirm it (nor can the LLMs when I ask for a source link for this info). Does any human out there have a source link? (Information source or source code, I guess.)

37.5. User Private Groups | Deployment Guide | Red Hat Enterprise Linux | 5 | Red Hat Documentation

37.5. User Private Groups | Deployment Guide | Red Hat Enterprise Linux | 5 | Red Hat Documentation

@siracusa i noticed that when i first started using macos x in the early aughts. ( A group name the same as a username ) . I’ve never seen it documented or a reason for it .
@petersibley @siracusa Not macOS-specific documentation, but the general reason for doing this is explained in the RedHat docs that @siracusa linked: https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/5/html/deployment_guide/s1-users-groups-private-groups
37.5. User Private Groups | Deployment Guide | Red Hat Enterprise Linux | 5 | Red Hat Documentation

37.5. User Private Groups | Deployment Guide | Red Hat Enterprise Linux | 5 | Red Hat Documentation