So I have a bug in a script in my init.d directory and bottom line...I can't completely boot the pi.
How can I boot into runlevel 1 (single user mode) so I can fix the bug?
That's not exactly a way to enter runlevel 1, but there is "safe mode" boot option in raspberry Pi firmware. To enable it, you have to insert a jumper between pins 5 and 6 on P1 (GPIO) header when booting.
If you do this, bootloader will ignore the
config.txt file (except from
avoid_safe_mode option which can be used to disable this feature) and will try to boot
kernel_emergency.img (if available) instead of
kernel_emergency.img has special emergency
initramfs build in and it will boot to this busybox based OS so that you can fix the problems in your OS manually (or change kernel boot parameters to run runlevel 1 at next boot). Remember to run
sync before powering down since
shutdown commands may not work.
add to the end of the line
hit ok, then Esc to boot...... it will boot you in to a command line
(this will do something)
# mount -n -o remount,rw /
(this will remount / so you can make changes)
now you should be able to edit the init.d config......
Several of the other answers here are now incorrect:
The GPIO jumper pin method was removed from the upstream OS, so it only works now if you're using a NOOBS image
Raspbian Jessie's move to systemd breaks the
init=/bin/sh hack. When you do this, it complains,
can't access tty: job control turned off
Fortunately, there is a solution that works, which actually gives real single-user access: add a space and a
1 at the end of
cmdline.txt, right after the
The hold-Shift boot menu doesn't exist with the stock Raspbian Jessie OS image, so you'll have to do this by editing
/boot/cmdline.txt from another computer if you aren't using the NOOBS image.
I couldn't find a way to force the pi to boot into runlevel 1 so I fired up a fedora live disk I had laying around and used the terminal to remove the script in question from the /etc/init.d directory
If you want to access and change SD card Linux partition files from Windows you can do it with one of these utilities.
Boot into runlevel 1
$ sudo init 1
After booting into runlevel 1
NOTE: to runlevel 1, change the file
id:2:initdefault: to something similar like: