what can I get the posix standard?

I wanted study and write a unix like system. who can help me.

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Removed the garbled characters... not sure why they were there...

See if this link helps you: POSIX� 1003.1 Frequently Asked Questions

Use the Single UNIX Specification, version 3. It is also known as POSIX.1:2001.

Available online at www.unix-systems.org
i.e. part of the Open Group.

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