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http://www.thegeekstuff.com/2010/09/linux-file-system-structure/

Linux Directory Structure (File System Structure) Explained with Examples

Have you wondered why certain programs are located under /bin, or /sbin, or /usr/bin, or /usr/sbin? For example, less command is located under /usr/bin directory. Why not /bin, or /sbin, or /usr/sbin? What is the different between all these directories?