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| | The /usr filesystem is often
large, since all programs are installed there. All files
in /usr usually come from a Linux
distribution; locally installed programs and other stuff goes
below /usr/local. 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
/usr are listed below (some of the less
important directories have been dropped; see the FSSTND for
more information).
- /usr/X11R6
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 /usr/X11R6 similar
to that below /usr itself.
- /usr/X386
Similar to
/usr/X11R6, but for X11 Release 5.
- /usr/bin
Almost all user commands.
Some commands are in /bin
or in /usr/local/bin.
- /usr/sbin
System administration commands that are
not needed on the root filesystem, e.g., most server
programs. - /usr/man, /usr/info, /usr/doc
Manual pages, GNU Info documents, and
miscellaneous other documentation files, respectively.
- /usr/include
Header files for the C
programming language. This should actually be below
/usr/lib for consistency, but the
tradition is overwhelmingly in support for this name.
- /usr/lib
Unchanging data files for programs and
subsystems, including some site-wide configuration
files. The name lib comes from library;
originally libraries of programming subroutines
were stored in /usr/lib.
- /usr/local
The place for locally installed software
and other files.
|