References

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[Open16]The IEEE and The Open Group. The Open Group Base Specifications Issue 7. IEEE Std 1003.1-2008, 2016 Edition. Utility Conventions. Retreived from http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/ V1_chap12.html
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[Free16]Free Software Foundation (July 25, 2016). GNU Standards for Command-Line Interfaces. Retrieved from https://www.gnu.org/prep/standards/ standards.html#Command_002dLine-Interfaces
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