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RedHat 9 (Linux i386) - man page for ldconfig (redhat section 8)

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ldconfig(8)									      ldconfig(8)

NAME
       ldconfig - configure dynamic linker run-time bindings

SYNOPSIS
       ldconfig [OPTION...]

DESCRIPTION
       ldconfig  creates the necessary links and cache (for use by the run-time linker, ld.so) 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 (/usr/lib and /lib).  ldconfig
       checks the header and file names of the libraries it  encounters  when  determining  which
       versions  should  have their links updated.  ldconfig ignores symbolic links when scanning
       for libraries.

       ldconfig will attempt to deduce the type of ELF libs (ie. libc 5.x or  libc  6.x  (glibc))
       based  on  what	C  libraries if any the library was linked against, therefore when making
       dynamic libraries, it is wise to explicitly link against  libc  (use  -lc).   ldconfig  is
       capable	of  storing  multiple ABI types of libraries into a single cache on architectures
       which allow native running of multiple ABIs, like ia32/ia64/x86_64 or sparc32/sparc64.

       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  like  this
       "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.

       Directory names containing an = are no longer legal unless they also have an expected type
       specifier.

       ldconfig  should  normally  be run by the super-user as it may require write permission on
       some root owned directories and files. If you use -r option to change the root  directory,
       you don't have to be super-user though as long as you have sufficient right to that direc-
       tory tree.

OPTIONS
       -v --verbose
	      Verbose mode.  Print current version number, the name of each directory  as  it  is
	      scanned and any links that are created.

       -n     Only  process directories specified on the command line.	Don't process the trusted
	      directories (/usr/lib and /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-cache
	      Print the lists of directories and candidate libraries stored in the current cache.

       -c --format=FORMAT
	      Use FORMAT for the cache file. Choices are old, new and compat (the default).

       -? --help --usage
	      Print usage information.

       -V --version
	      Print version and exit.

EXAMPLES
	      # /sbin/ldconfig -v
       will set up the correct links for the shared binaries and rebuild the cache.
	      # /sbin/ldconfig -n /lib
       as root after the installation of a new shared library will  properly  update  the  shared
       library symbolic links in /lib.

FILES
       /lib/ld-linux.so.*  execution time linker/loader
       /etc/ld.so.conf	   File  containing  a	list  of  colon,  space,  tab,	newline, or comma
			   spearated 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.  This file is not in human readable for-
			   mat, and is not intended to be edited.
       lib*.so.version	   shared libraries

SEE ALSO
       ldd(1), ld.so(8).

BUGS
       ldconfig, being a user process, must be run manually  and  has  no  means  of  dynamically
       determining  and  relinking shared libraries for use by ld.so when a new shared library is
       installed.

AUTHORS
       Andreas Jaeger.	Manual page written by David Engel and Mitch D'Souza.

					 30 October 2000			      ldconfig(8)
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