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Ok, so 'ls' lists files and directories.
But is there somewhere a file that stores all the tree or something like that?
In other words, what happens when you run 'ls' command? Where and how does the 'ls' command look for the information? Where is the information stored?
I am not discouraging the continuing of this question, by all means, ask away. But just an FYI:
From a newbies perspective, that really shouldn't matter at all. If you are programming, or if you are simply THAT hard corps, go for it. But don't overwhelm yourself with info like that if you are just learning linux, there's much more stuff that where 'ls' comes from