NAME

       ldconfig - configure dynamic linker run-time bindings

SYNOPSIS

       /sbin/ldconfig [ -nNvXV ] [ -f conf ] [ -C cache ] [ -r root ] directory ...
       /sbin/ldconfig -l [ -v ] library ...
       /sbin/ldconfig -p

DESCRIPTION

       ldconfig  creates  the  necessary  links  and  cache  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,
       /lib  and  /usr/lib  (on  some  64-bit  architectures  such  as  x86-64, lib and /usr/lib are the trusted
       directories for 32-bit libraries, while /lib64 and /usr/lib64 are used for 64-bit libraries).

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

       ldconfig  will  attempt to deduce the type of ELF libs (i.e., libc5 or libc6/glibc) based on what C libs,
       if any, the library was linked against.

       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 used only for
       those ELF libs 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 not allowed.  Also see the -p
       option.  ldconfig should normally be run by the superuser as it may require write permission on some root
       owned directories and files.

OPTIONS

       -c fmt, --format=fmt
              (Since glibc 2.2) Cache format to use: old, new, or compat (default).

       -C cache
              Use cache instead of /etc/ld.so.cache.

       -f conf
              Use conf instead of /etc/ld.so.conf.

       -i, --ignore-aux-cache
              (Since glibc 2.7) Ignore auxiliary cache file.

       -l     (Since  glibc 2.2) Library mode.  Manually link individual libraries.  Intended for use by experts
              only.

       -n     Only process directories specified on the command line.  Don't process  the  trusted  directories,
              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.

       -p, --print-cache
              Print the lists of directories and candidate libraries stored in the current cache.

       -r  root
              Change to and use root as 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.

       -X     Don't update links.  Unless -N is also specified, the cache is still rebuilt.

FILES

       /lib/ld.so          Run-time linker/loader.
       /etc/ld.so.conf     File containing a list  of  directories,  one  per  line,  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, as well as those found in the trusted directories.

SEE ALSO

       ldd(1), ld.so(8)

COLOPHON

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