> Sure. Think of Git as a three layered tool. 
>> The top layer is a polished interface, called "Porcelain", that is 
>> designed to easily manage snapshots and compares and merges of filesystem 
>> trees. 
>> The bottom layer, on the other hand, is a filesystem. Files in this 
>> filesystem are read-only. The names of files are fixed based on their 
>> content. So identical files have the same name, and are stored once in the 
>> file system. 
>> Building up from fixed files that do not change, are directory objects, 
>> that map human understandable filenames to internal names. And, since this 
>> is itself a filesystem object, if everything in a directory is identical, 
>> then the directory entry is identical, and only stored once. 
>> Based on this, it's pretty easy to see that if two commits are completely 
>> identical, then the only thing that differs is the commit object itself, 
>> which will have a time stamp and user comment. 
>> (The middle layer by the way, are low-level tools designed to work with 
>> the files in this filesystem.) 
Dear Michael & Philip,

Thanks. I think I am getting a hang of it.

So, when an existing file is modified then I assume that Git computes its 
signature and then checks if such a file already exists.
Is this correct? I ask this because my change can be such that it is same 
as one that was previously committed (sort of reverting back a file).

The other thing I understand is that Git always stores every unique 
instance of a file as it is and not its differences with a reference file.

One more question I have is on the file system. As such when I clone a 
repository, I get full repository and files locally.
So, when I clone a repository, I have full repository and one set of 
project files (depending on the branch I have checked out) locally)


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