What is POSIX Shell

What is POSIX Shell?

POSIX is the acronym for "Portable Operating System Interface". The POSIX shell is based on Portable Operating System Interface (POSIX) - a standard defined in IEEE P1003.2. It is a set of standards compiled by IEEE and promulgated by ANSI and ISO. POSIX makes the task of cross-platform software development easy. There are various POSIX versions, but the most important are POSIX.1 and POSIX.2, which define system calls and the command line interface.

What is POSIX?

POSIX defines the application programming interface (API), as well as the Unix command line shell and utility interface. This ensures the software's compatibility with Unix and other operating systems. POSIX shells are implemented for many UNIX-like operating systems. The POSIX standard is intended for use by application programmers and system administrators. Most POSIX shell functionality is similar to the Korn Shell.

The following operating systems are 100% compliant with various POSIX standards:

A/UX

AIX

HP-UX

INTEGRITY

IRIX

OS X

QNX

Solaris

Tru64

UnixWare

Please note that GNU/Linux (most distributions) and *BSD operating systems are not officially certified as POSIX compliant, But it was largely complied with.

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