# ldconfig - configure dynamic linker run-time bindings - man(8) - [phpMan]

[_ldconfig_(8)](https://www.chedong.com/phpMan.php/man/ldconfig/8/markdown)                            System Manager's Manual                           [_ldconfig_(8)](https://www.chedong.com/phpMan.php/man/ldconfig/8/markdown)

## 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 **ex‐
       pects 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
       **--format=_**fmt_
### -c _
              glibc 2.32, the default is **new**.  Before that, it was **compat**.

### -C _
              Use _cache_ instead of _/etc/ld.so.cache_.

### -f _
              Use _conf_ instead of _/etc/ld.so.conf_.

### --ignore-aux-cache
### -i     

### -l     
              Intended for use only by experts.

### -n     
              directories, nor those specified in _/etc/ld.so.conf_.  Implies **-N**.

### -N      -X 

### --print-cache
### -p     

### -r _
              Change to and use _root_ as the root directory.

### --verbose
### -v     
              scanned, and any links that are created.  Overrides quiet mode.

### --version
### -V     

### -X      -N 

## 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)](https://www.chedong.com/phpMan.php/man/ldd/1/markdown), [**ld.so**(8)](https://www.chedong.com/phpMan.php/man/ld.so/8/markdown)

Linux man-pages 6.7                          2023-10-31                                  [_ldconfig_(8)](https://www.chedong.com/phpMan.php/man/ldconfig/8/markdown)