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====== Linux Permissions Introduction ======
<color darkorange>2016</color>

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For someone like me who comes from a Windows background, Linux permissions were somewhat confusing, so here is a little reminder because from time to time, I do forget (okay, all the time).
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First the structure, I have an example file that I will use, to show this file and its permissions, from a command line enter:
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    ls -al
    
    The output is:
    
    "-rw-r--r-- 1 pi pi 4452 Jul 25 18:01 example.py"
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The part we are interest in is at the start of the line:
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    "-rw-r--r--"
    
    A 10 character section that can be split up as:
    
    "-" This denotes file or directory "-" = File, "d" = Directory
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Then we have three sets of three characters, and these are the different permissions for:
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    "rw-" - Owner
    "r--" - Group
    "r--" - Other
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Remember:
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    r is for read, w is for write and x is for execute.
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So for our example:
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    "-rw-r--r-- 1 pi pi 4452 Jul 25 18:01 example.py"
    
    "-" means its a file
    "rw-" Owner has read + write permissions
    "r--" Group has read only
    "r--" Other has read only.
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Who is the Owner and Group?
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    "-rw-r--r-- 1 pi pi 4452 Jul 25 18:01 example.py"
    
    In this example, pi is the owner and they are a member of the pi group
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