POSIX is a standard, or rather a whole series of standards. It also covers things like the shell and shell utilities, and the semantics of various kernel services, as well as the C libraries. These days you might want to look up SUS (Single Unix Specification) too.
POSIX is a standard, or rather a whole series of standards. It also covers things like the shell and shell utilities, and the semantics of various kernel services, as well as the C libraries. These days you might want to look up SUS (Single Unix Specification) too.
https://en.wikipedia.org/wiki/Single_UNIX_Specification
https://en.wikipedia.org/wiki/POSIX