Upon computer boot-up, and after the Kernel process is started, it traditionally launched the '''init '''process (usually Process ID #: 1). This important process manages (launches) other common services.In many ways, the init process is the "ancestor process" and any process that is currently running on the Unix/Linux system is either directly or indirectly related to the init process. Traditionally, the init program would run default processes that were defined in "shell scripts" contained in appropriate run-level directory.