Solaris

{0} ok boot cdrom -s 
# mount /dev/dsk/c0t0d0s0 /a 
# cd /a/etc/ 
# vi /etc/shadow 
root ::0::::::

{0} ok boot cdrom -s 

# mount /dev/dsk/c4t1d0s0 /a 
NOTICE: mount: not a UFS magic number (0x0) 
mount: /dev/dsk/c4t1d0s0 is not this fstype 

# mount -F zfs /dev/dsk/c4t1d0s0 /a 
cannot open '/dev/dsk/c4t1d0s0': invalid dataset name

mkdir -p /mnt/a /mnt/b
zpool import -f -R /mnt/a rpool
zfs set mountpoint=legacy rpool/ROOT/solaris
mount -F zfs rpool/ROOT/solaris /mnt/b
vi /mnt/b/etc/shadow
...
umount /mnt/b
zfs set mountpoint=/ rpool/ROOT/solaris
zpool export rpool
init 6