real operating system n. The sort the speaker is used to. People from the BSDophilic academic community are likely to issue comments
like "System V? Why don't you use a *real* operating
system?", people from the commercial/industrial UNIX sector are
known to complain "BSD? Why don't you use a *real*
operating system?", and people from IBM object "UNIX? Why don't
you use a *real* operating system?" See holy wars,
religious issues, proprietary, Get a real computer!