Hi coco0185,
Even SharePoint don't log adding/editing sql aliases through cliconfig tool, but if you enabled Audit policy on your SharePoint server , you can search cross event viewer -> security, because adding/editing an entry in cliconfig will add a key in registery
editor as the following screenshots


And any changes to the registery editor will add an event to the event viewer => security .
Best Regrads, Ahmed Madany MCTS @twitter http://twitter.com/ahmed_madany @Blog http://ahmedmadany.wordpress.com @LinkedIn http://eg.linkedin.com/pub/ahmed-madany/35/80/2b6