LDCONFIG(8) manual page
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ldconfig - configure dynamic linker run-time bindings
/sbin/ldconfig [ -nNvXV ] [ -f conf ] [ -C cache ] [ -r root ] directory ...
/sbin/ldconfig -l [ -v ] library ...
/sbin/ldconfig -p
ldconfig
creates the necessary links and cache to the most recent shared libraries
found in the directories specified on the command line, in the file /etc/ld.so.conf,
and in the trusted directories (/lib and /usr/lib). The cache is used by
the run-time linker, ld.so or ld-linux.so. ldconfig checks the header and filenames
of the libraries it encounters when determining which versions should have
their links updated.
ldconfig will attempt to deduce the type of ELF libs
(i.e., libc5 or libc6/glibc) based on what C libs, if any, the library was
linked against.
Some existing libs do not contain enough information
to allow the deduction of their type. Therefore, the /etc/ld.so.conf file
format allows the specification of an expected type. This is used only for
those ELF libs which we can not work out. The format is "dirname=TYPE",
where TYPE can be libc4, libc5, or libc6. (This syntax also works on the
command line.) Spaces are not allowed. Also see the -p option. ldconfig should
normally be run by the superuser as it may require write permission on
some root owned directories and files.
- -v
- Verbose mode. Print current
version number, the name of each directory as it is scanned, and any links
that are created. Overrides quiet mode.
- -n
- Only process directories specified
on the command line. Don’t process the trusted directories (/lib and /usr/lib)
nor those specified in /etc/ld.so.conf. Implies -N.
- -N
- Don’t rebuild the cache.
Unless -X is also specified, links are still updated.
- -X
- Don’t update links.
Unless -N is also specified, the cache is still rebuilt.
- -f conf
- Use conf
instead of /etc/ld.so.conf.
- -C cache
- Use cache instead of /etc/ld.so.cache.
- -r
root
- Change to and use root as the root directory.
- -l
- Library mode. Manually
link individual libraries. Intended for use by experts only.
- -p
- Print the
lists of directories and candidate libraries stored in the current cache.
- /lib/ld.so
- run-time linker/loader
- /etc/ld.so.conf
- File containing a list
of colon, space, tab, newline, or comma-separated directories in which to
search for libraries.
- /etc/ld.so.cache
- File containing an ordered list of
libraries found in the directories specified in /etc/ld.so.conf, as well
as those found in /lib and /usr/lib.
ldd(1)
, ld.so(8)
This
page is part of release 3.78 of the Linux man-pages project. A description
of the project, information about reporting bugs, and the latest version
of this page, can be found at http://www.kernel.org/doc/man-pages/.
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