What is POSIX Shell under UNIX / Linux operating systems?
POSIX Shell is based on the standard defined in Portable Operating System Interface (POSIX) - IEEE P1003.2.
The POSIX shell is implemented for many UNIX like operating systems.
The POSIX standard is designed to be used by both application programmers and system administrators.
Most of the POSIX Shell features are similar to the Korn Shell.
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