Manpage of LDCONFIG


Section: Linux Programmer's Manual (8)
Updated: 2017-09-15


ldconfig - configure dynamic linker run-time bindings  


/sbin/ldconfig [-nNvXV] [-f conf] [-C cache] [-r root] directory...

/sbin/ldconfig-l[-v] library...



ldconfigcreates the necessary links and cache to the most recent shared libraries found in the directories specified on the command line, in the file /etc/, and in the trusted directories, /liband /usr/lib(on some 64-bit architectures such as x86-64, liband /usr/libare the trusted directories for 32-bit libraries, while /lib64and /usr/lib64are used for 64-bit libraries).

The cache is used by the run-time linker, ld.soor ldconfigchecks the header and filenames of the libraries it encounters when determining which versions should have their links updated.

ldconfigwill 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/ format allows the specification of an expected type. This is used onlyfor 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 notallowed. Also see the -poption. ldconfigshould 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 cacheinstead of /etc/
-f conf
Use confinstead of /etc/
-i, --ignore-aux-cache
(Since glibc 2.7) Ignore auxiliary cache file.
(Since glibc 2.2) Library mode. Manually link individual libraries. Intended for use by experts only.
Process only the directories specified on the command line. Don't process the trusted directories, nor those specified in /etc/ Implies -N.
Don't rebuild the cache. Unless -Xis 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 rootas 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.
Don't update links. Unless -Nis also specified, the cache is still rebuilt.


Run-time linker/loader.
File containing a list of directories, one per line, in which to search for libraries.
File containing an ordered list of libraries found in the directories specified in /etc/, as well as those found in the trusted directories.






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