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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 ] 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).	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  (ie.  libc5  or
       libc6/glibc)  based  on	what  C	 libs,	if any, the library was linked
       against.	 Therefore, when making	 dynamic  libraries,  it  is  wise  to
       explicitly link against libc (use -lc).

       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,  new-
			   line,  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.



GNU C Library			  2002-05-06			   LDCONFIG(8)
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