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.  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 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 4.15 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
								    2017-09-15							       LDCONFIG(8)