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LDCONFIG(8)                Linux Programmer's Manual               LDCONFIG(8)



NAME
       /sbin/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 only used for those ELF libs which we can not work out.
       The format is "dirname=TYPE", where TYPE can be libc4, libc5, or libc6.  (This syn-
       tax  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 3.22 of the Linux man-pages project.  A description of
       the project, and information about reporting bugs, can be found at  http://www.ker-
       nel.org/doc/man-pages/.



GNU                               2009-04-15                       LDCONFIG(8)

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