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<A NAME="843"> </A><H1><A NAME="SECTION00430000000000000000">The <tt>/usr</tt> filesystem</A></H1>
<P>
The <tt>/usr</tt><A NAME="845"> </A> filesystem is often large, since all programs
are installed there. All files in <tt>/usr</tt><A NAME="847"> </A> usually come from
a Linux distribution; locally installed programs and other
stuff goes below <tt>/usr/local</tt><A NAME="849"> </A>. This makes it possible to
update the system from a new version of the distribution, or even
a completely new distribution, without having to install all programs
again.
Some of the subdirectories of <tt>/usr</tt><A NAME="851"> </A> are listed below (some of
the less important directories have been dropped; see the FSSTND
for more information).
<DL ><DT><STRONG><tt>/usr/X11R6</tt><A NAME="853"> </A></STRONG>
<DD>
The X Window System, all files. To simplify the development
and installation of X, the X files have not been
integrated into the rest of the system. There is a
directory tree below <tt>/usr/X11R6</tt><A NAME="855"> </A> similar to that below
<tt>/usr</tt><A NAME="857"> </A> itself.
<DT><STRONG><tt>/usr/X386</tt><A NAME="859"> </A></STRONG>
<DD>
Similar to <tt>/usr/X11R6</tt><A NAME="861"> </A>, but for X11 Release 5.
<DT><STRONG><tt>/usr/bin</tt><A NAME="863"> </A></STRONG>
<DD>
Almost all user commands. Some commands are in
<tt>/bin</tt><A NAME="865"> </A> or in <tt>/usr/local/bin</tt><A NAME="867"> </A>.
<DT><STRONG><tt>/usr/sbin</tt><A NAME="869"> </A></STRONG>
<DD>
System administration commands that are not needed on
the root filesystem, e.g., most server programs.
<DT><STRONG><tt>/usr/man</tt><A NAME="871"> </A>, <tt>/usr/info</tt><A NAME="873"> </A>, <tt>/usr/doc</tt><A NAME="875"> </A></STRONG>
<DD>
Manual pages, GNU Info documents, and miscellaneous
other documentation files, respectively.
<DT><STRONG><tt>/usr/include</tt><A NAME="877"> </A></STRONG>
<DD>
Header files for the C programming language. This should
actually be below <tt>/usr/lib</tt><A NAME="879"> </A> for consistency, but
the tradition is overwhelmingly in support for this name.
<DT><STRONG><tt>/usr/lib</tt><A NAME="881"> </A></STRONG>
<DD>
Unchanging data files for programs and subsystems, including
some site-wide configuration files. The name <tt>lib</tt>
comes from library; originally libraries of programming
subroutines were stored in <tt>/usr/lib</tt><A NAME="883"> </A>.
<DT><STRONG><tt>/usr/local</tt><A NAME="885"> </A></STRONG>
<DD>
The place for locally installed software and other files.
<P>
</DL><BR> <HR>
<P><ADDRESS>
<I>Lars Wirzenius <BR>
Sat Nov 15 02:32:11 EET 1997</I>
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