POSIX (Portable Operating System Interface) is a collection of standards created to promote compatibility between operating systems. POSIX standards are crucial in the world of software development, especially for those working with UNIX-based systems such as Linux. These standards ensure that different operating systems handle file systems, character devices, and other basic system-level functions in a similar way.

Introduction to the Cygwin program environment in the encyclopedia

LSB is a set of code standards designed to reduce the differences between Linux distributions