1LDCONFIG(8)                Linux Programmer's Manual               LDCONFIG(8)
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NAME

6       ldconfig - configure dynamic linker run-time bindings
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SYNOPSIS

9       /sbin/ldconfig [-nNvXV] [-f conf] [-C cache] [-r root] directory...
10       /sbin/ldconfig -l [-v] library...
11       /sbin/ldconfig -p
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DESCRIPTION

14       ldconfig  creates  the  necessary  links  and  cache to the most recent
15       shared libraries found in the  directories  specified  on  the  command
16       line, in the file /etc/ld.so.conf, and in the trusted directories, /lib
17       and /usr/lib (on some 64-bit architectures  such  as  x86-64,  lib  and
18       /usr/lib are the trusted directories for 32-bit libraries, while /lib64
19       and /usr/lib64 are used for 64-bit libraries).
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21       The cache is used by the run-time linker, ld.so or ld-linux.so.  ldcon‐
22       fig checks the header and filenames of the libraries it encounters when
23       determining which versions should have their links updated.
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25       ldconfig will attempt to deduce the type of ELF libraries (i.e.,  libc5
26       or  libc6/glibc)  based  on  what  C libraries, if any, the library was
27       linked against.
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29       Some existing libraries do not contain enough information to allow  the
30       deduction  of  their  type.  Therefore, the /etc/ld.so.conf file format
31       allows the specification of an expected type.  This is  used  only  for
32       those  ELF  libraries  which  we  can  not  work  out.   The  format is
33       "dirname=TYPE", where TYPE can be libc4, libc5, or libc6.  (This syntax
34       also works on the command line.)  Spaces are not allowed.  Also see the
35       -p option.  ldconfig should normally be run by the superuser as it  may
36       require write permission on some root owned directories and files.
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OPTIONS

39       -c fmt, --format=fmt
40              (Since  glibc  2.2)  Cache  format  to  use: old, new, or compat
41              (default).
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43       -C cache
44              Use cache instead of /etc/ld.so.cache.
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46       -f conf
47              Use conf instead of /etc/ld.so.conf.
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49       -i, --ignore-aux-cache
50              (Since glibc 2.7) Ignore auxiliary cache file.
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52       -l     (Since  glibc  2.2)  Library  mode.   Manually  link  individual
53              libraries.  Intended for use by experts only.
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55       -n     Process  only  the  directories  specified  on the command line.
56              Don't process the trusted directories, nor  those  specified  in
57              /etc/ld.so.conf.  Implies -N.
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59       -N     Don't rebuild the cache.  Unless -X is also specified, links are
60              still updated.
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62       -p, --print-cache
63              Print the lists of directories and candidate libraries stored in
64              the current cache.
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66       -r root
67              Change to and use root as the root directory.
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69       -v, --verbose
70              Verbose  mode.   Print  current version number, the name of each
71              directory as it is scanned, and  any  links  that  are  created.
72              Overrides quiet mode.
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74       -V, --version
75              Print program version.
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77       -X     Don't  update  links.  Unless -N is also specified, the cache is
78              still rebuilt.
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FILES

81       /lib/ld.so
82              Run-time linker/loader.
83       /etc/ld.so.conf
84              File containing a list of directories, one per line, in which to
85              search for libraries.
86       /etc/ld.so.cache
87              File containing an ordered list of libraries found in the direc‐
88              tories specified in /etc/ld.so.conf, as well as those  found  in
89              the trusted directories.
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SEE ALSO

92       ldd(1), ld.so(8)
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COLOPHON

95       This  page  is  part of release 4.15 of the Linux man-pages project.  A
96       description of the project, information about reporting bugs,  and  the
97       latest     version     of     this    page,    can    be    found    at
98       https://www.kernel.org/doc/man-pages/.
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102GNU                               2017-09-15                       LDCONFIG(8)
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