> there’s really no proprietary UNIX maker left Except for Apple, HP, Oracle and IBM. https://en.wikipedia.org/wiki/Single_UNIX_Specification#Currently_regist

> there’s really no proprietary UNIX maker left Except for Apple, HP, Oracle and IBM. https://en.wikipedia.org/wiki/Single_UNIX_Specification#Currently_registered_UNIX_systems https://en.wikipedia.org/wiki/Single_UNIX_Specification#Curr... Oracle is not in the list because they just decided to stop paying for certification, other than that Solaris should still be compliant.