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 Filesystem Hierarchy Standard - Definition 

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



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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Filesystem Hierarchy Standard".