ldconfig(8)



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

NAME
       ldconfig - configure dynamic linker run-time bindings

SYNOPSIS
       /sbin/ldconfig  [  -nNvXV ] [ -f conf ] [ -C cache ] [ -r root ] direc-
       tory ...
       /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.  ldcon-
       fig 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
       This page is part of release 4.05 of the Linux  man-pages  project.   A
       description  of  the project, information about reporting bugs, and the
       latest    version    of    this    page,    can     be     found     at
       https://www.kernel.org/doc/man-pages/.

GNU                               2015-03-29                       LDCONFIG(8)

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