Butler is a utility for automating repetitive tasks in Mac OS XMac OS X (official IPA pronunciation: ) is a line of proprietary, graphical operating systems developed, marketed, and sold by Apple Inc., the latest of which is pre-loaded on all currently shipping Macintosh computers. Mac OS X is the successor to the original Mac OS, which had been Apple's primary operating system (OS) since 1984. Unlike its predecessor, Mac OS X is a Unix OS (no longer considered Unix-like due to the system having achieved the standard required by The Open Group) built on technology that had been developed ...Mac OS X by Peter Maurer.