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 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)
Linux man-pages 6.03 2023-01-07 ldconfig(8)
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