ldconfig
Section: Maintenance Commands (8)
Updated: 2023-01-07
Index
Return to Main Contents
NAME
ldconfig - configure dynamic linker run-time bindings
SYNOPSIS
[-nNvVX]
[-C~cache]
[-f~conf]
[-r~root]
directory~...
-l
[-v]
library~...
-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)
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- OPTIONS
-
- FILES
-
- SEE ALSO
-
This document was created by
man2html,
using the manual pages.
Time: 16:32:44 GMT, April 27, 2024