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→Tutorial Reference Material
* [https://en.wikipedia.org/wiki/Decimal Decimal] , [https://en.wikipedia.org/wiki/Binary_number Binary] , [https://en.wikipedia.org/wiki/Octal Octal] , [https://en.wikipedia.org/wiki/Hexadecimal Hexadecimal] Numbers<br>
| style="padding-left:15px;"|File Permission Concepts* Directory Permissions<br>* File Permissions<br><br>File Permission Commands<br>
* [http://man7.org/linux/man-pages/man1/chmod.1.html chmod]<br>
* [http://man7.org/linux/man-pages/man1/umask.1p.html umask]<br><br>
