Linux file hierarchy:
/bin - common binaries
/sbin - Binaries used for system administration are placed here.
/boot - static files of the boot loader. Usually it contain the Linux kernel, Grub boot loader files and so on.
/dev - device files such as your CD drive, hard disk, and any other physical device. (In Linux/Unix, the common premise is that everything is a file).
/home - user home directories are found here. In unices like FreeBSD, the home directories are found in /usr/home. And in Solaris it is in /export. So quite a big difference here.
/lib - Essential shared libraries and kernel modules
/mnt - temporary mount point useful for when you insert your USB stick and it gets mounted under /mnt. Though in Ubuntu and the likes, it is usually mounted under /media.
/var - variable data, such as logs, news, mail spool files and so on which is constantly being modified by various programs running on your system.
/tmp - temporary files are placed here by default.
/usr - the secondary hierarchy which contain its own bin and sbin sub-directories.
/etc - Usually contain the configuration files for all the programs that run on your Linux/Unix system.
/opt - Third party application packages which does not conform to the standard Linux file hierarchy can be installed here.
/srv - Contains data for services provided by the system.
/proc - And of course there is the directory which does not actually reside on the disk.
And some links:
link: http://www.goitexpert.com/entry.cfm?entry=A-guide-to-Linux-directory-structure--Part-One
link: http://www.itweek.co.uk/personal-computer-world/features/2184995/linux-disaster-recovery
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