[nycbug-talk] why /var?
Isaac Levy
ike
Sat Feb 19 21:13:09 EST 2005
For the record on this thread, a client's RedHat system,
--
Linux huck 2.4.21-4.ELsmp #1 SMP Fri Oct 3 17:52:56 EDT 2003 i686 i686
i386 GNU/Linux
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 only
holds 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).
/dos If both MS-DOS and Linux are run on one computer, this is
a typ-
ical place to mount a DOS file system.
/etc Contains configuration files which are local to the
machine.
Some larger software packages, like X11, can have their
own sub-
directories 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 nec-
essary to boot the system and to run the commands in
the root
filesystem.
/mnt This directory contains mount points for temporarily
mounted
filesystems
/opt This directory should contain add-on packages that
contain
static files.
/proc This is a mount point for the proc filesystem, 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 sys-
tem, but which are usually not executed by normal users.
/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-Windows 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-Windows 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 boot-
ing 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-Windows
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 cor-
rectly 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 exe-
cutables which usually are not invoked directly. More
compli-
cated 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 usu-
ally 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
archi-
tectures 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
administra-
tion 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
Manpages 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
architec-
tures 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 datebase 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 dis-
tributions 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 sym-
bolic 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 filesystem. The format used is
that of HDU
UUCP lock files, i.e. 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
direc-
tory 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(1).
/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.
CONFORMS TO
The Filesystem Hierarchy Standard, Version 2.2
<http://www.path-
name.com/fhs/>
BUGS
This list is not exhaustive; different systems may be
configured dif-
ferently.
SEE ALSO
find(1), ln(1), mount(1), proc(5), The Filesystem Hierarchy
Standard
Linux 2001-09-07
HIER(7)
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