Earlier quoted context omitted.
No there were some unix-like systems running at that time, three or four years before OS/2.
"Some" is an understatement and "unix-like" is kind of funny. There were several strains of unix available when OS/2 was released in 1985. System V: https://en.wikipedia.org/wiki/System_5 BSD: https://en.wikipedia.org/wiki/BSD SunOS: https://en.wikipedia.org/wiki/SunOS Xenix: https://en.wikipedia.org/wiki/Xenix https://en.wikipedia.org/wiki/Xenix (which was created by the eventually infamous Santa Cruz Operation - SC…
SCO ported Xenix to a few processors for Microsoft starting with 8086/8088. It wasn't until 1987 that SCO ownership of Xenix.