Trying S100 HDR in low light

Runlevels is one of those things that struck me when first using Linux as a bit weird, only later to discover in life that it's one of those over engineered elements from UNIX that one just ends up ignoring instead of doing anything about it.

0    Halt
1(S)       Single-user
2    Not used
3    Multi-user
4    Not used
5    X11
6    Reboot

In /etc/inittab I actually bother to use runlevel 5, like so:

x:5:once:/bin/su - -- hendry -l -c '/usr/bin/startx </dev/null >/dev/null 2>&1'

To boot into runlevel 5, you need to append '5' to your Linux boot /proc/cmdline, like so in my /boot/syslinux/syslinux.cfg:

# (0) Arch Linux
LABEL arch
	MENU LABEL Arch Linux
	LINUX ../vmlinuz-linux
	APPEND root=/dev/sdb1 ro 5
	INITRD ../initramfs-linux.img

As you can see this is quite the nightmare to script if you wanted your new machine to be automatically configured with your config from git. So I am making a note of this, so I have a reference when I spend the customary day setting up my Archlinux box once purchasing a new machine.

If you run runlevel, you can confirm which runlevel you're in. You can run init 6 to reboot and init 0 to halt. init 1 is to boot into an odd mode without networking IIRC, still don't actually know what it's all about.


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