Provided by: libc-bin_2.15-0ubuntu10_amd64 bug

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 sufficient 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 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.

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)