ldconfig: add page (#1536)

pages/linux/ldconfig.md

@@ -0,0 +1,15 @@
+# ldconfig
+
+> Configure symlinks and cache for shared library dependencies.
+
+- Update symlinks and rebuild the cache (usually run when a new library is installed):
+
+`sudo ldconfig`
+
+- Update the symlinks for a given directory:
+
+`sudo ldconfig -n {{path/to/directory}}`
+
+- Print the libraries in the cache and check whether a given library is present:
+
+`ldconfig -p | grep {{library_name}}`