3/11/2016 FilesystemHierarchyStandard Debian Wiki
The Filesystem Hierarchy Standard (FHS) defines the main directories and their contents in Linux and other Unixlike computer operating systems.
Overview
The process of developing a standard FileSystemhierarchy began in August 1993 with an effort to restructure the file and directory structure of Linux. The FSSTND (Filesystem Standard), a filesystem hierarchy standard specific to the Linux operating system, was released on February 14, 1994. Subsequent revisions were released on October 9, 1994 and March 28, 1995.
In early 1996, the goal of developing a more comprehensive version of FSSTND to address not only Linux, but other Unixlike systems was adopted with the help of members of the BSD development community. As a result, a concerted effort was made to focus on issues that were general to Unixlike systems. In recognition of this widening of scope, the name of the standard was changed to Filesystem Hierarchy Standard or FHS for short.
The FHS is maintained by the Free Standards Group, a nonprofit organization consisting of major software and hardware vendors, such as HP, IBM and Dell. Still, the vast majority of the Linux distributions, including those developed by members of the Free Standards Group, do not follow this proposed standard. In particular, paths specifically created by the FHS editors, such as /media/ and /srv/, do not see widespread usage. Some Unix and Linux systems break with the FHS in favor of a different approach, as in Gobo Linux.
Directory structure
All files and directories appear under the ?root_directory "/", even if stored on different physical devices.
A description of the hierarchy specified in the FHS
/bin/ Essential command executable (binaries) for all users (e.g., cat, ls, cp) (especially files required to boot or rescue the system)
/boot/
Boot loader, kernels and initrd files
/dev/ devices files (e.g., :/dev/null)
/etc/ Hostspecific systemwide configuration files (from et cetera)
/home/ Users' home directories
/lib/ Libraries essential for the binaries in /bin/ and /sbin/ (library required to boot or rescue the system) https://wiki.debian.org/FilesystemHierarchyStandard 1/3 3/11/2016 FilesystemHierarchyStandard Debian Wiki /lost+found/ Some files and fragment that were "recovered" during the previous fsck (Not part of FHS)
/mnt/ Temporarily mounted filesystems
/media/ Mount points for removable media such as CDROMs (appeared in FHS2.3)
/opt/ Addon application software packages Precompiled, non ".deb" binary distribution (tar'ed..) goes here. /opt/bin/ : Same as for toplevel hierarchy /opt/include/ : Same as for toplevel hierarchy /opt/lib/ : Same as for toplevel hierarchy /opt/sbin/ : Same as for toplevel hierarchy /opt/share/ : Same as for toplevel hierarchy
/proc/ Virtual filesystem documenting kernel and process status, mostly text files (e.g., uptime, network)
/root/ Home directory for the root user
/sbin/ System administrative binaries (e.g., init, route, ifup) (system binaries) (files required to boot or rescue the system)
/tmp/ Temporary files
/selinux/ SELinux runtime settings (Not part of FHS).
/srv/ Sitespecific data which is served by the system (Not part of FHS).
/sys/ The filesystem for exporting kernel objects. (many /proc/* files should have been here...)
/usr/ Secondary hierarchy for shareable, readonly data (formerly from UNIX source repository, now from UNIX system resources) (files that are notrequired to boot or rescue the system) /usr/bin/ : Same as for toplevel hierarchy /usr/include/ : Standard include files /usr/lib/ : Same as for toplevel hierarchy /usr/sbin/ : Same as for toplevel hierarchy https://wiki.debian.org/FilesystemHierarchyStandard 2/3 3/11/2016 FilesystemHierarchyStandard Debian Wiki /usr/share/ : Architectureindependent (shared) data /usr/src/ : Source code (to build debian packages. see also /usr/local/src/) /usr/X11R6/ : X Window System, Version 11 Release 6 /usr/local/ : Tertiary hierarchy for local data installed by the system administrator /usr/local/bin : locally compiled binaries, local shell script, etc. /usr/local/src : Source code (place where to extract and build non debian'ized stuffs)
/var/ Variable data, such as logs, databases, websites, and temporary spool (email..) files
https://wiki.debian.org/FilesystemHierarchyStandard 3/3