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NAME | SYNOPSIS | DESCRIPTION | OPTIONS | FILES | SEE ALSO | COLOPHON |
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LDCONFIG(8) Linux Programmer's Manual LDCONFIG(8)
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 (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 will attempt to deduce the type of ELF libraries (i.e.,
libc5 or libc6/glibc) based on what C libraries, if any, the library
was linked against.
Some existing libraries 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 libraries 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.
-c fmt, --format=fmt
(Since glibc 2.2) Cache format to use: old, new, or compat
(default).
-C cache
Use cache instead of /etc/ld.so.cache.
-f conf
Use conf instead of /etc/ld.so.conf.
-i, --ignore-aux-cache
(Since glibc 2.7) Ignore auxiliary cache file.
-l (Since glibc 2.2) Library mode. Manually link individual
libraries. Intended for use by experts only.
-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.
-p, --print-cache
Print the lists of directories and candidate libraries stored
in the current cache.
-r root
Change to and use root as the root directory.
-v, --verbose
Verbose mode. Print current version number, the name of each
directory as it is scanned, and any links that are created.
Overrides quiet mode.
-V, --version
Print program version.
-X Don't update links. Unless -N is also specified, the cache is
still rebuilt.
/lib/ld.so
Run-time linker/loader.
/etc/ld.so.conf
File containing a list of directories, one per line, 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 the trusted directories.
ldd(1), ld.so(8)
This page is part of release 4.15 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
https://www.kernel.org/doc/man-pages/.
GNU 2017-09-15 LDCONFIG(8)
Pages that refer to this page: dpkg-divert(1), ldd(1), dlopen(3), rtld-audit(7), ld.so(8), sln(8)
Copyright and license for this manual page
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