POSIX is a set of standards which are mainitained by the XOPEN group. During the cource of time many POSIX standards have orignated like POSIX-3,UNIX95 and UNIX 98. ALl the UNIX vendors have to take certify their unixes to some POSIX standards every 2 years. If they dont then XOPEN(a non-profit organisation) has the copyright on the word 'UNIX". If the vedors fail to take the POSIX certificate they arent allowed to call their OS an UNIX.
If an UNIX-clone says it is POSIX compliant it means that any application return in a another POSIX compliant UNIX-clone should compile and run successfully without any modifications to the code.
Below isthelink to the XOPEN group which specify all the POSIX standands and certify OSes.
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