NAME

       ldconfig - configure dynamic linker run-time bindings

SYNOPSIS

       /sbin/ldconfig [-nNvVX] [-C cache] [-f conf] [-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  should normally be run by the superuser as it may
       require write permission on some root owned directories and files.

       ldconfig will look only at files that are named lib*.so* (for regular shared  objects)  or
       ld-*.so*  (for  the  dynamic loader itself).  Other files will be ignored.  Also, ldconfig
       expects a certain pattern to how the symbolic links are set up, like this  example,  where
       the middle file (libfoo.so.1 here) is the SONAME for the library:

           libfoo.so -> libfoo.so.1 -> libfoo.so.1.12

       Failure to follow this pattern may result in compatibility issues after an upgrade.

OPTIONS

       -c fmt
       --format=fmt
              (Since glibc 2.2) Use cache format fmt, which is one of old, new, or compat.  Since
              glibc 2.32, the default is new.  Before that, it was compat.

       -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) Interpret each operand as a libary name and configure its  links.
              Intended for use only by experts.

       -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
              is the run-time linker/loader.
       /etc/ld.so.conf
              contains a list of directories, one per line, in which to search for libraries.
       /etc/ld.so.cache
              contains  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)