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POSIX (Portable Open System in Unix) is a name originally
coined by Richard Stallman for a family of open system
standards based on Unix. There are a
number of aspects of Unix under consideration for
standardization, from the basic system services at the system
call and C library level to applications and tools to system
administration and management. Each area of standardization is
assigned to a IEEE working group in the 1003 series. Thus,
POSIX 1003.2 means Unis shell and utilities standard developed by IEEE
Working Group 1003.2 (=POSIX.2).
POSIX 1003.2 (POSIX.2) concentrates on the command
interpreter interface and utility programs commonly executed from
the command line or by other programs. An initial version of the
standard has been approved and published by the IEEE, and work is
currently underway to update it. A good example of POSIX-compliant
shell is
bash shell.
Therefore, you can reasonably expect standard behaivoirs from any program
compliant to POSIX.2 standard regardless of its platform and operating
system.
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