[Jgeneral] Installation Instructions for J on Mac

[Fraser Jackson]

I recently tried to assist a professorial colleague install J on a Mac OS X 
and I asked another similar long term Mac user to assist. However the 
instructions left them completely baffled as to what to do.  Neither was 
familiar with the instructions at the command level and neither had any idea 
what Sudo was and how to access it.  They used a Mac because they normally 
never had to concern themselves with such things.

Can anyone explain simply what to do?  Its 15+ years since I knew anything 
about using a Mac. 

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