[rescue] OS X is certified UNIX

[ajones]

> the 'software' suite was crap and intended solely to meet govt 'open
> system' definition, not for actual use.  the subsystem was developed by
> interix to be a posix-compliant layer over the nt microkernel in place
> of the ms win32 layer.  it's generally considered to be more stable
> than win32 also.  i'm a little surprised ms didn't kill it after they
> bought interix.
They did.  Their original subsystem was really pathetic, and it used the 
MKS toolkit for the userspace tools.  (To give you an impression of how 
awful it was, they shipped a "ksh", but it wasn't AT&T ksh, it used some 
bizarre re-implementation with entirely different behaviour.)

As soon as they bought Interix, they deprecated their old sham of a 
POSIX subsystem.  Interix was faster, better, and genuinely standards 
compliant.