What to do if you lost the root password in Solaris 9-10
If you forget the root password and you cannot log into the system, you will have to do the following:
Load the Solaris cdrom (This does not have to be the same Solaris version as the machine.)
Take the machine down to the PROM level -
# init 0 (or halt)
When it comes down to the OK prompt -
OK boot cdrom -s
When it is back up -
# mount /dev/dsk/c0t0d0s0 /a (your root device/partition)
# fsck /dev/dsk/c0t0d0s0 (optional, if you can’t mount disk)
# cd /a/etc
# TERM=vt100;export TERM
# vi shadow and remove second field on root line
The root line should like -
root::12345:::::: (it must start root:: the other values are not important)
wq! (or x!)
init 6 (or reboot)
When the machine comes back up -
passwd (set a new root password)
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