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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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NAME | SYNOPSIS | DESCRIPTION | OPTIONS | FILES | SEE ALSO | COLOPHON |
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ldconfig(8) System Manager's Manual ldconfig(8)
ldconfig - configure dynamic linker run-time bindings
/sbin/ldconfig [-nNvVX] [-C cache] [-f conf] [-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. On some 64-bit architectures such as x86-64,
/lib and /usr/lib are the trusted directories for 32-bit
libraries, while /lib64 and /usr/lib64 are used for 64-bit
libraries.
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 should normally be run by the superuser as it
may require write permission on some root owned directories and
files.
ldconfig will look only at files that are named lib*.so* (for
regular shared objects) or ld-*.so* (for the dynamic loader
itself). Other files will be ignored. Also, ldconfig expects a
certain pattern to how the symbolic links are set up, like this
example, where the middle file (libfoo.so.1 here) is the SONAME
for the library:
libfoo.so -> libfoo.so.1 -> libfoo.so.1.12
Failure to follow this pattern may result in compatibility issues
after an upgrade.
--format=fmt
-c fmt (Since glibc 2.2) Use cache format fmt, which is one of
old, new, or compat. Since glibc 2.32, the default is new.
Before that, it was compat.
-C cache
Use cache instead of /etc/ld.so.cache.
-f conf
Use conf instead of /etc/ld.so.conf.
--ignore-aux-cache
-i (Since glibc 2.7) Ignore auxiliary cache file.
-l (Since glibc 2.2) Interpret each operand as a library name
and configure its links. Intended for use only by experts.
-n Process only the directories specified on the command line;
don't process the trusted directories, 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.
--print-cache
-p Print the lists of directories and candidate libraries
stored in the current cache.
-r root
Change to and use root as the root directory.
--verbose
-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.
--version
-V Print program version.
-X Don't update links. Unless -N is also specified, the cache
is still rebuilt.
/lib/ld.so
is the run-time linker/loader.
/etc/ld.so.conf
contains a list of directories, one per line, in which to
search for libraries.
/etc/ld.so.cache
contains an ordered list of libraries found in the
directories specified in /etc/ld.so.conf, as well as those
found in the trusted directories.
ldd(1), ld.so(8)
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
for this manual page, see
⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
This page was obtained from the tarball man-pages-6.15.tar.gz
fetched from
⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
2025-08-11. If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-
to-date source for the page, or you have corrections or
improvements to the information in this COLOPHON (which is not
part of the original manual page), send a mail to
[email protected]
Linux man-pages 6.15 2025-05-17 ldconfig(8)
Pages that refer to this page: dpkg-divert(1), ldd(1), dlopen(3), rtld-audit(7), ld.so(8), sln(8)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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