AtheOS is not ment to be a new UNIX, and I don't want AtheOS to be tied on hands and feets to fit within the boundaries of UNIX and POSIX. Nevertheless AtheOS does support large part's of the POSIX standard, and are therefor capable of running a wide range of the command line tools you normaly finds on a UNIX system. Some functionality is not there cause I have not have any need for it yet, or I have not had the time to implement it. Yet some other features are ommitted cause they are to incompatible with other features in AtheOS.

I also might mention that I do not have the POSIX standard, so most of it is implemented after linux/irix MAN pages :)
Consequently not all the POSIX like function's are 100% conforming, but again they work well enough to make most utils I have attacked to compile.