mkinitcpio: add page (#5250)

pages/linux/mkinitcpio.md

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+# mkinitcpio
+
+> Generates initial ramdisk environments for booting the Linux kernel based on the specified preset(s).
+> More information: <https://man.archlinux.org/man/mkinitcpio.8>.
+
+- Perform a dry run (print what would be done without actually doing it):
+
+`mkinitcpio`
+
+- Generate a ramdisk environment based on the `linux` preset:
+
+`mkinitcpio --preset {{linux}}`
+
+- Generate a ramdisk environment based on the `linux-lts` preset:
+
+`mkinitcpio --preset {{linux-lts}}`
+
+- Generate ramdisk environments based on all existing presets (used to regenerate all the initramfs images after a change in `/etc/mkinitcpio.conf`):
+
+`mkinitcpio --allpresets`
+
+- Generate an initramfs image using an alternative configuration file:
+
+`mkinitcpio --config {{path/to/mkinitcpio.conf}} --generate {{path/to/initramfs.img}}`
+
+- Generate an initramfs image for a kernel other than the one currently running (the installed kernel releases can be found in `/usr/lib/modules/`):
+
+`mkinitcpio --kernel {{kernel_version}} --generate {{path/to/initramfs.img}}`
+
+- List all available hooks:
+
+`mkinitcpio --listhooks`
+
+- Display help for a specific hook:
+
+`mkinitcpio --hookhelp {{hook_name}}`