(POSIX), which stands for " Portable Operating System Interface [for Unix]". is a set of standards that, for the naming and definition of the icon programming interface applications in environments Unix-like on your iPhone, Tripple Indo-defined. These standards, under the general name IEEE 1003 and the name of the international ISO/IEC 9945 are known, it is possible to matched storage and communication, and the fling easier, the environment, the above-mentioned provides. Words offer the founder of the Free Software Foundation, Richard Stallman.

This standard can be found in about any operating system, and the other was applied. Standard initial ., the IEEE Std 1003.1-1988 was set, updated it is these days, ISO/IEC 9945 to be read.

This standard consists of 17 separate document is that the standards of the line, command, interface, scripting, etc. application level user, service, and tools like awk and echo, and ed, along with input standard output (file, terminal, network), and thread, etc defined.

documents are in three parts divided have been:
API Cornell
commands and tools
tests related to the verification of compliance with

some of the operating system, fully compatible with words are from BSD/OS, HP-UX, etc. for Mac OS ten, ^ " extension writing, and Solaris, and OpenSolaris. It is noted that the system is operating, the ferry, SS, etc., GNU/Linux, etc. NetBSD., the OpenBSD including the operating system, that are largely compatible with have memorized.

finally it should be mentioned that other operating systems, too, through the layers of translator and tools matching donor, the compatibility with move. Including the operating system can be Symbian, 9, the Windows NT and XP ( with service pack one onwards), Windows Server 2003, and Windows Vista noted.