This posix system is really easy to memorize. I think that an understanding is probably important, but I watched almost an hour or video instructions to make this simple note. That is the totality of permissions to date for the class. 0-7 is pretty simple, especially because it is only 0,1,2, and 4. If nothing else, Linux is efficient!
It is important to know because high-level languages are the first steps towards coding and Linux really is ever present. I no longer dread learning Linux. I have come to a turning point and welcome the challenges it presents.
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From @pastbastard