init
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# `init`

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This chapter describes the `init` process, which is the first user level process started by the kernel. `init` has many important duties, such as starting `getty` (so that users can log in), implementing run levels, and taking care of orphaned processes. This chapter explains how `init` is configured and how you can make use of the different run levels.

- `init` comes first
- Configuring `init`: the `/etc/inittab` file
- Run levels
- Special configuration in `/etc/inittab`
- Booting in single user mode