The Linux Directory Layout
/ The nameless base of the filesystem. All other directories, files, drives, and devices are attached to this root. Commonly (but incorrectly) referred to as the “slash” or “/” directory. The “/” is just a directory separator, not a directory itself.
/bin Essential command binaries (programs) are stored here (bash, ls, mount, tar, etc.)
/boot Static files of the boot loader.
/dev Device files. In Linux, hardware devices are acceessd just like other files, and they are kept under this directory.
/etc Host-specific system configuration files.
/home Location of users' personal home directories (e.g. /home/susan).
/lib Essential shared libraries and kernel modules.
/proc Process information pseudo-filesystem. An interface to kernel data structures.
/root The root (superuser) home directory.
/sbin Essential system binaries (fdisk, fsck, init, etc).
/tmp Temporary files. All users have permission to place temporary files here.
/usr The base directory for most shareable, read-only data (programs, libraries, documentation, and much more).
/usr/bin Most user programs are kept here (cc, find, du, etc.).
/usr/lib Libraries for most binary programs.
/usr/local “Locally” installed files. This directory only really matters in environments where files are stored on the network. Locally-installed files go in /usr/local/bin, /usr/local/lib, etc.). Also often used for software packages installed from source, or software not officially shipped with the distribution.
/usr/sbin Non-vital system binaries (lpd, useradd, etc.)
/usr/share Architecture-independent data (icons, backgrounds, documentation, terminfo, man pages, etc.).
/usr/src Program source code. E.g. The Linux Kernel, source RPMs, etc.
/var Variable data: mail and printer spools, log files, lock files, etc.
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