Changes

:* Perform various '''numbering conversions ''' between the '''decimal''', '''binary''', '''octal ''' and '''hexadecimal ''' numbering systems by hand without the use of a computer or calculator

:* Identify '''which numbering system conversion method to use based on test question''' when required to perform a numbering conversion

:* Understand directory and regular file '''permissions'''

:* Learn how to '''set ''' directory and regular file '''permissions ''' with the '''chmod''' command (symbolic and octal methods)

:* Learn how to use the '''umask ''' command to have permissions for directories and files automatically set upon their '''creation'''