The Filesystem Hierarchy Standard (FHS) defines the main directories and their contents in Linux and other Unix-like computer operating systems. All files and directories appear under the root directory "/", even if stored on different physical devices. Directories defined by the FHS include:

Directory	Description
/bin/	Essential command binaries for all users (e.g., cat, ls, cp)
/boot/	Boot loader files (e.g., kernels, initrd)
/dev/	Essential devices (e.g., /dev/null)
/etc/	Host-specific system-wide configuration files (from et cetera)
/etc/opt/	Configuration files for /opt/
/etc/X11/ (optional)	Configuration files for the X Window System, version 11
/etc/sgml/ (optional)	Configuration files for SGML
/etc/xml/ (optional)	Configuration files for XML
/home/ (optional)	Users' home directories
/lib/	Libraries essential for the binaries in /bin/ and /sbin/
/mnt/	Temporarily mounted filesystems
/media/	Mount points for removable media such as CD-ROMs (appeared in FHS-2.3)
/opt/	Static application software packages
/proc/	Virtual filesystem documenting kernel and process status, mostly text files (e.g., uptime, network)
/root/ (optional)	Home directory for the root user
/sbin/	Essential binaries for root (e.g., init, route, ifup) (superuser binaries)
/tmp/ (optional)	Temporary files
/usr/	Secondary hierarchy for shareable, read-only (user) data
/usr/bin/	Same as for top-level hierarchy
/usr/include/	Standard include files
/usr/lib/	Same as for top-level hierarchy
/usr/sbin/	Same as for top-level hierarchy
/usr/share/	Architecture-independent (shared) data
/usr/src/ (optional)	Source code
/usr/X11R6/ (optional)	X Window System, Version 11 Release 6
/usr/local/	Tertiary hierarchy for local data installed by the system administrator
/var/	Variable files, such as logs and temporary files

External links

• Home of the FHS standard (http://www.pathname.com/fhs/)

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