hier

HIER(7)                    Linux Programmer's Manual                   HIER(7)



NAME
       hier - description of the file system hierarchy

DESCRIPTION
       A typical Linux system has, among others, the following directories:

       /      This is the root directory.  This is where the whole tree
              starts.

       /bin   This directory contains executable programs which are needed in
              single user mode and to bring the system up or repair it.

       /boot  Contains static files for the boot loader.  This directory holds
              only the files which are needed during the boot process.  The
              map installer and configuration files should go to /sbin and
              /etc.

       /dev   Special or device files, which refer to physical devices.  See
              mknod(1).

       /etc   Contains configuration files which are local to the machine.
              Some larger software packages, like X11, can have their own
              subdirectories below /etc.  Site-wide configuration files may be
              placed here or in /usr/etc.  Nevertheless, programs should
              always look for these files in /etc and you may have links for
              these files to /usr/etc.

       /etc/opt
              Host-specific configuration files for add-on applications
              installed in /opt.

       /etc/sgml
              This directory contains the configuration files for SGML and XML
              (optional).

       /etc/skel
              When a new user account is created, files from this directory
              are usually copied into the user's home directory.

       /etc/X11
              Configuration files for the X11 window system (optional).

       /home  On machines with home directories for users, these are usually
              beneath this directory, directly or not.  The structure of this
              directory depends on local administration decisions.

       /lib   This directory should hold those shared libraries that are
              necessary to boot the system and to run the commands in the root
              file system.

       /media This directory contains mount points for removable media such as
              CD and DVD disks or USB sticks.

       /mnt   This directory is a mount point for a temporarily mounted file
              system.  In some distributions, /mnt contains subdirectories
              intended to be used as mount points for several temporary file
              systems.

       /opt   This directory should contain add-on packages that contain
              static files.

       /proc  This is a mount point for the proc file system, which provides
              information about running processes and the kernel.  This
              pseudo-file system is described in more detail in proc(5).

       /root  This directory is usually the home directory for the root user
              (optional).

       /sbin  Like /bin, this directory holds commands needed to boot the
              system, but which are usually not executed by normal users.

       /srv   This directory contains site-specific data that is served by
              this system.

       /tmp   This directory contains temporary files which may be deleted
              with no notice, such as by a regular job or at system boot up.

       /usr   This directory is usually mounted from a separate partition.  It
              should hold only sharable, read-only data, so that it can be
              mounted by various machines running Linux.

       /usr/X11R6
              The X-Window system, version 11 release 6 (optional).

       /usr/X11R6/bin
              Binaries which belong to the X-Window system; often, there is a
              symbolic link from the more traditional /usr/bin/X11 to here.

       /usr/X11R6/lib
              Data files associated with the X-Window system.

       /usr/X11R6/lib/X11
              These contain miscellaneous files needed to run X;  Often, there
              is a symbolic link from /usr/lib/X11 to this directory.

       /usr/X11R6/include/X11
              Contains include files needed for compiling programs using the
              X11 window system.  Often, there is a symbolic link from
              /usr/include/X11 to this directory.

       /usr/bin
              This is the primary directory for executable programs.  Most
              programs executed by normal users which are not needed for
              booting or for repairing the system and which are not installed
              locally should be placed in this directory.

       /usr/bin/X11
              is the traditional place to look for X11 executables; on Linux,
              it usually is a symbolic link to /usr/X11R6/bin.

       /usr/dict
              Replaced by /usr/share/dict.

       /usr/doc
              Replaced by /usr/share/doc.

       /usr/etc
              Site-wide configuration files to be shared between several
              machines may be stored in this directory.  However, commands
              should always reference those files using the /etc directory.
              Links from files in /etc should point to the appropriate files
              in /usr/etc.

       /usr/games
              Binaries for games and educational programs (optional).

       /usr/include
              Include files for the C compiler.

       /usr/include/X11
              Include files for the C compiler and the X-Window system.  This
              is usually a symbolic link to /usr/X11R6/include/X11.

       /usr/include/asm
              Include files which declare some assembler functions.  This used
              to be a symbolic link to /usr/src/linux/include/asm.

       /usr/include/linux
              This contains information which may change from system release
              to system release and used to be a symbolic link to
              /usr/src/linux/include/linux to get at operating system specific
              information.

              (Note that one should have include files there that work
              correctly with the current libc and in user space.  However,
              Linux kernel source is not designed to be used with user
              programs and does not know anything about the libc you are
              using.  It is very likely that things will break if you let
              /usr/include/asm and /usr/include/linux point at a random kernel
              tree.  Debian systems don't do this and use headers from a known
              good kernel version, provided in the libc*-dev package.)

       /usr/include/g++
              Include files to use with the GNU C++ compiler.

       /usr/lib
              Object libraries, including dynamic libraries, plus some
              executables which usually are not invoked directly.  More
              complicated programs may have whole subdirectories there.

       /usr/lib/X11
              The usual place for data files associated with X programs, and
              configuration files for the X system itself.  On Linux, it
              usually is a symbolic link to /usr/X11R6/lib/X11.

       /usr/lib/gcc-lib
              contains executables and include files for the GNU C compiler,
              gcc(1).

       /usr/lib/groff
              Files for the GNU groff document formatting system.

       /usr/lib/uucp
              Files for uucp(1).

       /usr/local
              This is where programs which are local to the site typically go.

       /usr/local/bin
              Binaries for programs local to the site.

       /usr/local/doc
              Local documentation.

       /usr/local/etc
              Configuration files associated with locally installed programs.

       /usr/local/games
              Binaries for locally installed games.

       /usr/local/lib
              Files associated with locally installed programs.

       /usr/local/include
              Header files for the local C compiler.

       /usr/local/info
              Info pages associated with locally installed programs.

       /usr/local/man
              Man pages associated with locally installed programs.

       /usr/local/sbin
              Locally installed programs for system administration.

       /usr/local/share
              Local application data that can be shared among different
              architectures of the same OS.

       /usr/local/src
              Source code for locally installed software.

       /usr/man
              Replaced by /usr/share/man.

       /usr/sbin
              This directory contains program binaries for system
              administration which are not essential for the boot process, for
              mounting /usr, or for system repair.

       /usr/share
              This directory contains subdirectories with specific application
              data, that can be shared among different architectures of the
              same OS.  Often one finds stuff here that used to live in
              /usr/doc or /usr/lib or /usr/man.

       /usr/share/dict
              Contains the word lists used by spell checkers.

       /usr/share/doc
              Documentation about installed programs.

       /usr/share/games
              Static data files for games in /usr/games.

       /usr/share/info
              Info pages go here.

       /usr/share/locale
              Locale information goes here.

       /usr/share/man
              Manual pages go here in subdirectories according to the man page
              sections.

       /usr/share/man/<locale>/man[1-9]
              These directories contain manual pages for the specific locale
              in source code form.  Systems which use a unique language and
              code set for all manual pages may omit the <locale> substring.

       /usr/share/misc
              Miscellaneous data that can be shared among different
              architectures of the same OS.

       /usr/share/nls
              The message catalogs for native language support go here.

       /usr/share/sgml
              Files for SGML and XML.

       /usr/share/terminfo
              The database for terminfo.

       /usr/share/tmac
              Troff macros that are not distributed with groff.

       /usr/share/zoneinfo
              Files for timezone information.

       /usr/src
              Source files for different parts of the system, included with
              some packages for reference purposes.  Don't work here with your
              own projects, as files below /usr should be read-only except
              when installing software.

       /usr/src/linux
              This was the traditional place for the kernel source.  Some
              distributions put here the source for the default kernel they
              ship.  You should probably use another directory when building
              your own kernel.

       /usr/tmp
              Obsolete.  This should be a link to /var/tmp.  This link is
              present only for compatibility reasons and shouldn't be used.

       /var   This directory contains files which may change in size, such as
              spool and log files.

       /var/adm
              This directory is superseded by /var/log and should be a
              symbolic link to /var/log.

       /var/backups
              Reserved for historical reasons.

       /var/cache
              Data cached for programs.

       /var/catman/cat[1-9] or /var/cache/man/cat[1-9]
              These directories contain preformatted manual pages according to
              their man page section.  (The use of preformatted manual pages
              is deprecated.)

       /var/cron
              Reserved for historical reasons.

       /var/lib
              Variable state information for programs.

       /var/local
              Variable data for /usr/local.

       /var/lock
              Lock files are placed in this directory.  The naming convention
              for device lock files is LCK..<device> where <device> is the
              device's name in the file system.  The format used is that of
              HDU UUCP lock files, that is, lock files contain a PID as a
              10-byte ASCII decimal number, followed by a newline character.

       /var/log
              Miscellaneous log files.

       /var/opt
              Variable data for /opt.

       /var/mail
              Users' mailboxes.  Replaces /var/spool/mail.

       /var/msgs
              Reserved for historical reasons.

       /var/preserve
              Reserved for historical reasons.

       /var/run
              Run-time variable files, like files holding process identifiers
              (PIDs) and logged user information (utmp).  Files in this
              directory are usually cleared when the system boots.

       /var/spool
              Spooled (or queued) files for various programs.

       /var/spool/at
              Spooled jobs for at(1).

       /var/spool/cron
              Spooled jobs for cron(8).

       /var/spool/lpd
              Spooled files for printing.

       /var/spool/mail
              Replaced by /var/mail.

       /var/spool/mqueue
              Queued outgoing mail.

       /var/spool/news
              Spool directory for news.

       /var/spool/rwho
              Spooled files for rwhod(8).

       /var/spool/smail
              Spooled files for the smail(1) mail delivery program.

       /var/spool/uucp
              Spooled files for uucp(1).

       /var/tmp
              Like /tmp, this directory holds temporary files stored for an
              unspecified duration.

       /var/yp
              Database files for NIS.

CONFORMING TO
       The Filesystem Hierarchy Standard, Version 2.2 ⟨http://www.pathname.com
       /fhs/⟩.

BUGS
       This list is not exhaustive; different systems may be configured
       differently.

SEE ALSO
       find(1), ln(1), proc(5), mount(8)

       The Filesystem Hierarchy Standard

COLOPHON
       This page is part of release 3.53 of the Linux man-pages project.  A
       description of the project, and information about reporting bugs, can
       be found at http://www.kernel.org/doc/man-pages/.



Linux                             2012-08-05                           HIER(7)