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 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 3.25 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/.



GNU                                                        2009-04-15                                                LDCONFIG(8)