|/bin /usr/bin||Contains programs available to all users|
|/sbin /usr/sbin||Contains programs meant to be used by system administrators|
|/var/log||Contains the log files made by various applications.|
|/home||Contains all the personal directories of the users of the system|
|/boot||Contains the files needed by the operating system to load itself into memory.|
|/etc||Contains the system configuration files used by various applications|
|/mnt||Contains the mount points for any removable devices in the system (floppy disks, CD Roms)|
|/proc||Contains the system state information. The info in the files of this directory is maintained directly by the operating system kernel.|
The /usr/local/bin directory usually holds new programs as and when they are installed.
Shared libraries reside in the /lib, /usr/lib and /usr/local/lib directories.
Transient and temporary files can be found under /var/tmp and /tmp. The /tmp directory is cleaned up by startup scripts after every reboot, but the /var/tmp directory is not.
The users home directories are usually created under /home