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).   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

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

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

FILES

       /lib/ld.so          run-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, as well as those found in /lib and /usr/lib.

SEE ALSO

       ldd(1), ld.so(8)

COLOPHON

       This  page  is  part  of  release 3.54 of the Linux man-pages project.  A description of the project, and
       information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.