Contains true (.T.) if you are using FoxPro® for UNIX®.
Syntax
_UNIX = lExpression
Remarks
The _UNIX system variable contains true (.T.) if you are using FoxPro for UNIX. _UNIX contains false (.F.) if you are using a different platform version of FoxPro or Visual FoxPro.
The value contained in _UNIX cannot be changed with STORE or =.