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ldconfig(8)							   ldconfig(8)

       ldconfig - configure dynamic linker run-time bindings

       ldconfig [OPTION...]

       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

       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 dont have to be super-user
       though as long as you have sufficient right to that directory tree.

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

       -n     Only  process  directories specified on the command line.  Dont
	      process the trusted directories (/usr/lib and  /lib)  nor  those
	      specified in /etc/ld.so.conf.  Implies -N.

       -N     Dont rebuild the cache.  Unless -X is also specified, links are
	      still updated.

       -X     Dont 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).

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

       -V --version
	      Print version and exit.

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

       /lib/ld-linux.so.*  execution time linker/loader
       /etc/ld.so.conf	   File containing a list of colon, space,  tab,  new
			   line,  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

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

       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.

       Andreas	Jaeger.  Manual page written by David Engel and Mitch DSouza.

				27 August 2006			   ldconfig(8)

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