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It is the job of the bootloader to locate the -[kernel](The_kernel.md) on the harddrive and inject it into -memory so that they operating system can start. This is the boot process. +[kernel](The_kernel.md) on the harddrive and inject it into memory so that they +operating system can start. This is the boot process. ## Boot loaders @@ -65,10 +65,11 @@ The de facto standard boot loader for Linux is GRUB: Grand Unified Boot Loader. You see the GRUB default menu when you first start a Linux machine. It will offer you various options for loading your installed OS or other OSs. GRUB is a -filesystem like the main disk. If you press `e` in this screen you can view and -edit specific boot parameters. Pressing `c` gives you access to the GRUB command -line interface. This allows you to interact with GRUB in the same way as you -would with any other filesystem, allowing for advanced configuration. +[filesystem](./Filesystems.md) like the main disk. If you press `e` in this +screen you can view and edit specific boot parameters. Pressing `c` gives you +access to the GRUB command line interface. This allows you to interact with GRUB +in the same way as you would with any other filesystem, allowing for advanced +configuration. ## The boot sequence @@ -80,16 +81,16 @@ would with any other filesystem, allowing for advanced configuration. 3. The kernel initializes the devices and its drivers. 4. The kernel mounts the root filesystem. 5. The kernel starts a program called **init**. It has a - [process id](Processes.md#processes-ps) - of 1. This is the point at which [user space](User_Space.md) starts. + [process id](Processes.md#processes-ps) of 1. This is the point at which + [user space](User_Space.md) starts. 6. Init sets the rest of the system processes in motion. 7. At the end of the boot process, init starts a process allowing you to log in. ## Boot diagnostics -Linux keeps a log of the boot process as part of the [journal]() log of -everything that happens on disk. We can use the command `journalct -k` to view -the diagnostics generated during the boot. Here is a selection: +Linux keeps a log of the boot process as part of the [journal](./journald.md) +log of everything that happens on disk. We can use the command `journalct -k` to +view the diagnostics generated during the boot. Here is a selection: ``` Jul 07 07:12:58 archbish kernel: Linux version 5.18.5-arch1-1 (linux@archlinux) (gcc (GCC) 12.1.0, GNU ld (GNU Binutils) 2.38) #1 SMP PREEMPT_DYNAMIC Thu, 16 Jun 2022 20:40:45 +0000