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A Unix-like system behaves like a Unix system while not being certified to any version of the Single UNIX Specification. The term can include free and open-source operating systems inspired by Bell Labs' Unix and proprietary work-alike. The Open Group owns the UNIX trademark. UNIX name can be only used when certified by the Open Group. They do not support the construction "Unix-like," and consider it a misuse of their trademark.

List of certified UNIX operating systems

  • macOS from Apple
  • HP-UX from HP/HPE
  • AIX from IBM
  • SunOS/Solaris from Oracle

List of "Unix-like" operating systems

See also