launchd

launchd is a command line tool used in macOS and OS X operating systems. It is responsible for launching and managing daemons, agents, and programs at specific times or in response to various events. The tool originated in OS X 10.4 (Tiger) and has since become the primary initialization system. launchd is designed to optimize system performance by reducing resource usage when services are not in use. It functions as a replacement for several older initialization systems, such as init, inetd, and SystemStarter. Users can utilize launchd to schedule periodic or one-time tasks, such as running scripts, performing maintenance, or launching applications at login. Additionally, it offers error logging, relaunching capabilities, and a variety of configurable parameters for each launchd item.