ldconfig option X - When is it needed?
 

Hi,
I'm trying to understand ldconfig.
I can't find out when option X is needed.
I would be useful to see some examples.

From ldconfig help page:
-X Don't generate links

When do I need to update cache without links (re)generation?

If you want to just do a dry run test (ie, not add/remove links), you can use the '-X' flag along with the '-v' flag to see the list of links to be generated. You could alternatively use '-D', which holds off both the link generation and the cache update.