></TR
><TR
><TD
><TT
CLASS="FILENAME"
>shells</TT
></TD
><TD
>Pathnames of valid login shells (optional)</TD
></TR
><TR
><TD
><TT
CLASS="FILENAME"
>syslog.conf</TT
></TD
><TD
>Configuration file for syslogd (optional)</TD
></TR
></TBODY
></TABLE
><P
></P
></DIV
><P
><TT
CLASS="FILENAME"
>mtab</TT
> does not fit the static nature of
<TT
CLASS="FILENAME"
>/etc</TT
>: it is excepted for historical reasons.
<A
NAME="AEN722"
HREF="#FTN.AEN722"
><SPAN
CLASS="footnote"
>[7]</SPAN
></A
> </P
></DIV
><DIV
CLASS="SECTION"
><HR><H3
CLASS="SECTION"
><A
NAME="ETCOPTCONFIGURATIONFILESFOROPT"
>/etc/opt : Configuration files for /opt</A
></H3
><DIV
CLASS="SECTION"
><H4
CLASS="SECTION"
><A
NAME="PURPOSE7"
>Purpose</A
></H4
><P
>Host-specific configuration files for add-on application
software packages must be installed within the directory
<TT
CLASS="FILENAME"
>/etc/opt/<subdir></TT
>, where
<TT
CLASS="FILENAME"
><subdir></TT
> is the name of the subtree in
<TT
CLASS="FILENAME"
>/opt</TT
> where the static data from that package is
stored.</P
></DIV
><DIV
CLASS="SECTION"
><HR><H4
CLASS="SECTION"
><A
NAME="REQUIREMENTS4"
>Requirements</A
></H4
><P
>No structure is imposed on the internal arrangement of
<TT
CLASS="FILENAME"
>/etc/opt/<subdir></TT
>.</P
><P
>If a configuration file must reside in a different location in
order for the package or system to function properly, it may be placed
in a location other than
<TT
CLASS="FILENAME"
>/etc/opt/<subdir></TT
>.</P
><DIV
CLASS="TIP"
><P
></P
><TABLE
CLASS="TIP"
WIDTH="100%"
BORDER="0"
><TR
><TD
WIDTH="25"
ALIGN="CENTER"
VALIGN="TOP"
><IMG
SRC="tip.gif"
HSPACE="5"
ALT="Tip"></TD
><TH
ALIGN="LEFT"
VALIGN="CENTER"
><B
>Rationale</B
></TH
></TR
><TR
><TD
> </TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
>Refer to the rationale for <TT
CLASS="FILENAME"
>/opt</TT
>.</P
></TD
></TR
></TABLE
></DIV
></DIV
></DIV
><DIV
CLASS="SECTION"
><HR><H3
CLASS="SECTION"
><A
NAME="ETCX11CONFIGURATIONFORTHEXWINDOWS"
>/etc/X11 : Configuration for the X Window System (optional)</A
></H3
><DIV
CLASS="SECTION"
><H4
CLASS="SECTION"
><A
NAME="PURPOSE8"
>Purpose</A
></H4
><P
><SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>/etc/X11</I
></SPAN
> is the location for all X11
host-specific configuration. This directory is necessary to allow
local control if <SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>/usr</I
></SPAN
> is mounted read
only.</P
></DIV
><DIV
CLASS="SECTION"
><HR><H4
CLASS="SECTION"
><A
NAME="SPECIFICOPTIONS6"
>Specific Options</A
></H4
><P
>The following files, or symbolic links to files, must be in
<TT
CLASS="FILENAME"
>/etc/X11</TT
> if the corresponding subsystem is
installed:</P
><DIV
CLASS="INFORMALTABLE"
><P
></P
><A
NAME="AEN754"
></A
><TABLE
BORDER="0"
FRAME="void"
CLASS="CALSTABLE"
><COL
WIDTH="1*"
TITLE="C1"><COL
WIDTH="1*"
TITLE="C2"><THEAD
><TR
><TH
>File</TH
><TH
>Description</TH
></TR
></THEAD
><TBODY
><TR
><TD
><TT
CLASS="FILENAME"
>Xconfig</TT
></TD
><TD
>The configuration file for early versions of XFree86 (optional)</TD
></TR
><TR
><TD
><TT
CLASS="FILENAME"
>XF86Config</TT
></TD
><TD
>The configuration file for XFree86 versions 3 and 4 (optional)</TD
></TR
><TR
><TD
><TT
CLASS="FILENAME"
>Xmodmap</TT
></TD
><TD
>Global X11 keyboard modification file (optional)</TD
></TR
></TBODY
></TABLE
><P
></P
></DIV
><P
>Subdirectories of <TT
CLASS="FILENAME"
>/etc/X11</TT
> may include
those for <TT
CLASS="FILENAME"
>xdm</TT
> and for any other programs (some
window managers, for example) that need them.
<A
NAME="AEN778"
HREF="#FTN.AEN778"
><SPAN
CLASS="footnote"
>[8]</SPAN
></A
>
We recommend that window managers with only one configuration file
which is a default <TT
CLASS="FILENAME"
>.*wmrc</TT
> file must name it
<TT
CLASS="FILENAME"
>system.*wmrc</TT
> (unless there is a widely-accepted
alternative name) and not use a subdirectory. Any window manager
subdirectories must be identically named to the actual window manager
binary.</P
></DIV
></DIV
><DIV
CLASS="SECTION"
><HR><H3
CLASS="SECTION"
><A
NAME="ETCSGMLCONFIGURATIONFILESFORSGMLAN"
>/etc/sgml : Configuration files for SGML (optional)</A
></H3
><DIV
CLASS="SECTION"
><H4
CLASS="SECTION"
><A
NAME="PURPOSE9"
>Purpose</A
></H4
><P
>Generic configuration files defining high-level parameters of
the SGML systems are installed here. Files with names
<TT
CLASS="FILENAME"
>*.conf</TT
> indicate generic configuration files.
File with names <TT
CLASS="FILENAME"
>*.cat</TT
> are the DTD-specific
centralized catalogs, containing references to all other catalogs
needed to use the given DTD. The super catalog file
<TT
CLASS="FILENAME"
>catalog</TT
> references all the centralized
catalogs.</P
></DIV
></DIV
><DIV
CLASS="SECTION"
><HR><H3
CLASS="SECTION"
><A
NAME="AEN795"
>/etc/xml : Configuration files for XML (optional)</A
></H3
><DIV
CLASS="SECTION"
><H4
CLASS="SECTION"
><A
NAME="AEN797"
>Purpose</A
></H4
><P
>Generic configuration files defining high-level parameters of
the XML systems are installed here. Files with names
<TT
CLASS="FILENAME"
>*.conf</TT
> indicate generic configuration files.
The super catalog file
<TT
CLASS="FILENAME"
>catalog</TT
> references all the centralized
catalogs.</P
></DIV
></DIV
></DIV
><DIV
CLASS="SECTION"
><HR><H2
CLASS="SECTION"
><A
NAME="HOMEUSERHOMEDIRECTORIES"
>/home : User home directories (optional)</A
></H2
><DIV
CLASS="SECTION"
><H3
CLASS="SECTION"
><A
NAME="PURPOSE10"
>Purpose</A
></H3
><P
><TT
CLASS="FILENAME"
>/home</TT
> is a fairly standard concept, but it
is clearly a site-specific filesystem.
<A
NAME="AEN808"
HREF="#FTN.AEN808"
><SPAN
CLASS="footnote"
>[9]</SPAN
></A
>
The setup will differ from host to host. Therefore, no program should
rely on this location.
<A
NAME="AEN819"
HREF="#FTN.AEN819"
><SPAN
CLASS="footnote"
>[10]</SPAN
></A
> </P
></DIV
><DIV
CLASS="SECTION"
><HR><H3
CLASS="SECTION"
><A
NAME="REQUIREMENTS4A"
>Requirements</A
></H3
><P
>User specific configuration files for applications are stored in the
user's home directory in a file that starts with the '.' character (a
"dot file"). If an application needs to create more than one dot file
then they should be placed in a subdirectory with a name starting with