If the system displays this
error message and goes directly into
multiuser mode (run level 2) at boot time,
file is missing from the hard disk. The
utility must be present on the system to access single-user mode.
If this file is missing, log in as root and use the
to restore the /bin/sulogin file from
your root filesystem backup. You can also restore the file from the
command line by inserting the first volume of your last full backup
of the root filesystem into the tape drive and entering:
cpio -idv -I /dev/rct0 bin/sulogin
The default tape device is linked to /dev/rct0. If you are using a different device (such as /dev/rctmini), substitute it for /dev/rct0.