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] 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.  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 libraries (i.e.,  libc5
       or  libc6/glibc)  based  on  what  C libraries, if any, the library was
       linked against.

       Some existing libraries 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  libraries  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     Process  only  the  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 4.12 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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