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Traditionally, the '''init program would run default processes''' that were defined in "shell scripts" contained in appropriate '''run-level''' directory. The run level is a defined state that the Unix/Linux system is currently in (for example, graphical-mode, text-based mode with networking, text-based mode without networking, etc).
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[[Image:pstree.png|thumb|125px| '''pstree''' command displaying relationship between '''init''' and other services (processes).]]
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=== Why Switch to systemd? ===
