1LDCONFIG(8) Linux Programmer's Manual LDCONFIG(8)
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6 /sbin/ldconfig - configure dynamic linker run time bindings
7
9 /sbin/ldconfig [ -nNvXV ] [ -f conf ] [ -C cache ] [ -r root ] direc‐
10 tory ...
11 /sbin/ldconfig -l [ -v ] library ...
12 /sbin/ldconfig -p
13
15 ldconfig creates the necessary links and cache to the most recent
16 shared libraries found in the directories specified on the command
17 line, in the file /etc/ld.so.conf, and in the trusted directories (/lib
18 and /usr/lib). The cache is used by the run-time linker, ld.so or ld-
19 linux.so. ldconfig checks the header and filenames of the libraries it
20 encounters when determining which versions should have their links
21 updated.
22 ldconfig will attempt to deduce the type of ELF libs (ie. libc5 or
24 libc6/glibc) based on what C libs, if any, the library was linked
25 against. Therefore, when making dynamic libraries, it is wise to
26 explicitly link against libc (use -lc).
27 Some existing libs do not contain enough information to allow the
29 deduction of their type. Therefore, the /etc/ld.so.conf file format
30 allows the specification of an expected type. This is only used for
31 those ELF libs which we can not work out. The format is "dirname=TYPE",
32 where TYPE can be libc4, libc5, or libc6. (This syntax also works on
33 the command line.) Spaces are not allowed. Also see the -p option.
34 ldconfig should normally be run by the superuser as it may require
35 write permission on some root owned directories and files.
36
38 -v Verbose mode. Print current version number, the name of each
39 directory as it is scanned, and any links that are created.
40 Overrides quiet mode.
41 -n Only process directories specified on the command line. Don't
43 process the trusted directories (/lib and /usr/lib) nor those
44 specified in /etc/ld.so.conf. Implies -N.
45 -N Don't rebuild the cache. Unless -X is also specified, links are
47 still updated.
48 -X Don't update links. Unless -N is also specified, the cache is
50 still rebuilt.
51 -f conf
53 Use conf instead of /etc/ld.so.conf.
54 -C cache
56 Use cache instead of /etc/ld.so.cache.
57 -r root
59 Change to and use root as the root directory.
60 -l Library mode. Manually link individual libraries. Intended for
62 use by experts only.
63 -p Print the lists of directories and candidate libraries stored in
65 the current cache.
66
69 /lib/ld.so run-time linker/loader
70 /etc/ld.so.conf File containing a list of colon, space, tab, new‐
71 line, or comma-separated directories in which to
72 search for libraries.
73 /etc/ld.so.cache File containing an ordered list of libraries found
74 in the directories specified in /etc/ld.so.conf.
75GNU C Library 2002-05-06 LDCONFIG(8)