But before the dynamic loader can "see" this information, it must be converted into an ld.so.cache file. This is done by running the ldconfig command:

# ldconfig

When ldconfig completes, you now have an up-to-date /etc/ld.so.cache file that reflects any changes you've made to /etc/ld.so.conf. From this point forward, the dynamic loader will look in any new directories that you specified in /etc/ld.so.conf when looking for shared libraries.