A good reference for understanding the Linux file system is the
Wikipedia page on the Unix_filesystem.
/usr is where most of the user space programs and data reside
and once upon a time is where the user home directories lived, under
/dev is short for devices.
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Other online resources include the
Data Science Desktop Survival
Books available on Amazon include
Data Mining with Rattle
Essentials of Data Science.
Popular open source software includes
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