How to boot solaris x86 to single user mode
Here's how to boot Solaris x86 into single user mode:
At the GRUB menu, type 'e' before it times out and takes the default boot option.
Scroll to the default multiuser boot line, then type 'e' egain.
This will bring you in to edit mode. Add a ' -s' at the end of the line.
Note that the GRUB boot menu is typically stored in /boot/grub/menu.lst OR, if you're running live upgrade, use:
to list the available choices.