*BASH User Commands Ubuntu 10.04.4 LTS Server coreutils
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 don't 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.   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.

              # /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 D'Souza.

                               25 February 2008                    ldconfig(8)