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Linux/Unix Filesystem Hierarchy
 

From the Filesystem Hierarchy Standard:

/ Directory  

bin Essential command binaries
boot Static files of the boot loader
dev Device files
etc Host-specific system configuration
home User home directories
lib Essential shared libraries and kernel modules
mnt Mount point for mounting a filesystem temporarily
opt Add-on application software packages
root Home directory for the root user
sbin Essential system binaries
tmp Temporary files
usr Secondary hierarchy
var Variable data

/usr Directory  

X11R6 XWindow System, version 11 release 6
bin Most user commands
games Games and educational binaries
include Header files included by C programs
lib Libraries
local Local hierarchy (empty after main installation)
sbin Non-vital system binaries
share Architecture-independent data
src Source code

/var Directory  

account Process accounting logs (if supported)
cache Application cache data
crash System crash dumps (if supported)
games Variable game data
lib Variable state information
lock Lock files
log Log files and directories
mail User mailbox files
opt Variable data for /opt
run Data relevant to running processes
spool Application spool data
tmp Temporary files preserved between system reboots
yp Network Information Service (NIS) database files


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