LDCONFIG
Section: Linux Programmer's Manual (8)
Updated: 2017-09-15
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NAME
ldconfig - configure dynamic linker run-time bindings
SYNOPSIS
/sbin/ldconfig [
-nNvXV] [
-f conf] [
-C cache] [
-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
will attempt to deduce the type of ELF libraries (i.e., libc5 or libc6/glibc)
based on what C libraries, if any, the library was linked against.
Some existing libraries 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 used
only
for those ELF libraries 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
- -c fmt, --format=fmt
-
(Since glibc 2.2)
Cache format to use:
old,
new,
or
compat
(default).
- -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)
Library mode.
Manually link individual libraries.
Intended for use by experts only.
- -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
-
Run-time linker/loader.
- /etc/ld.so.conf
-
File containing a list of directories, one per line,
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,
as well as those found in the trusted directories.
SEE ALSO
ldd(1),
ld.so(8)
COLOPHON
This page is part of release 4.13 of the Linux
man-pages
project.
A description of the project,
information about reporting bugs,
and the latest version of this page,
can be found at
https://www.kernel.org/doc/man-pages/.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- OPTIONS
-
- FILES
-
- SEE ALSO
-
- COLOPHON
-
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