ldconfig(8)													       ldconfig(8)



NAME
       ldconfig - configure dynamic linker run-time bindings

SYNOPSIS
       ldconfig [OPTION...]

DESCRIPTION
       ldconfig  creates,  updates,  and removes the necessary links and cache (for use by the run-time linker, ld.so) 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  (/usr/lib	and  /lib).  ldconfig checks the header and file names of the libraries it encounters when
       determining which versions should have their links updated.  ldconfig ignores symbolic links when scanning for libraries.

       ldconfig will attempt to deduce the type of ELF libs (ie. libc 5.x or libc 6.x (glibc)) based on what C	libraries  if  any
       the  library  was  linked against, therefore when making dynamic libraries, it is wise to explicitly link against libc (use
       -lc).  ldconfig is capable of storing multiple ABI types of libraries into a single  cache  on  architectures  which  allow
       native running of multiple ABIs, like ia32/ia64/x86_64 or sparc32/sparc64.

       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 only used for those ELF libs which we can not work  out.
       The  format  is	like this "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.

       Directory names containing an = are no longer legal unless they also have an expected type specifier.

       ldconfig should normally be run by the super-user as it may require write permission on some  root  owned  directories  and
       files. If you use -r option to change the root directory, you don't have to be super-user though as long as you have suffi‐
       cient right to that directory tree.

OPTIONS
       -v --verbose
	      Verbose mode.  Print current version number, the name of each directory as it is scanned and any links that are cre‐
	      ated.

       -n     Only  process  directories specified on the command line.  Don't process the trusted directories (/usr/lib and /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-cache
	      Print the lists of directories and candidate libraries stored in the current cache.

       -c --format=FORMAT
	      Use FORMAT for the cache file. Choices are old, new and compat (the default).

       -i --ignore-aux-cache
	      Ignore auxiliary cache file.

       -? --help --usage
	      Print usage information.

       -V --version
	      Print version and exit.

EXAMPLES
	      # /sbin/ldconfig -v
       will set up the correct links for the shared binaries and rebuild the cache.
	      # /sbin/ldconfig -n /lib
       as root after the installation of a new shared library will properly update the shared library symbolic links in /lib.

FILES
       /lib/ld-linux.so.*  execution 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.
			   This file is not in human readable format, and is not intended to be edited.
       lib*.so.version	   shared libraries

SEE ALSO
       ldd(1), ld.so(8).

BUGS
       ldconfig, being a user process, must be run manually and has no means  of  dynamically  determining  and  relinking  shared
       libraries for use by ld.so when a new shared library is installed.

AUTHORS
       Andreas Jaeger.	Manual page written by David Engel and Mitch D'Souza.



							 25 February 2008					       ldconfig(8)