man > ldconfig(8)

ldconfig(8)                            System Manager's Manual                           ldconfig(8)

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 ex‐
       pects 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
       --format=fmt
       -c 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.

       --ignore-aux-cache
       -i     (Since glibc 2.7) Ignore auxiliary cache file.

       -l     (Since glibc 2.2) Interpret each operand as a library 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.

       --print-cache
       -p     Print the lists of directories and candidate libraries stored in the current cache.

       -r root
              Change to and use root as the root directory.

       --verbose
       -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.

       --version
       -V     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)

Linux man-pages 6.7                          2023-10-31                                  ldconfig(8)