This group gathers computing systems that are Unix or a Unix-like operating system, including the original Bell Labs Unix and its Research Unix lineage, the BSD family such as FreeBSD, 386BSD and BSD/OS, commercial vendor Unix implementations including Solaris, AIX, HP-UX, IRIX, Ultrix, DYNIX and DG/UX, Linux and its kernel and distributions, and third-party or platform-specific Unix ports and clones. Their shared identity is conforming to, or directly descending from, the Unix design and its POSIX-family interfaces, as distinct from a system that runs on an entirely different lineage such as DOS or a mainframe supervisor.