If the local directory database is damaged, boot into single- user mode by holding down -S as the system starts up. Next , check to see if you have a backup of the NetInfo database. The /etc/daily cron job backs up the database each time it is run. You can find the backup in /var/ backups /local.nidump . If you don't have a backup, you won't be able to restore. The local.nidump file is overwritten each time the cron job runs, so make sure you back it up regularly (preferably to some form of removable media).
After the system boots in single-user mode, you should:
After you have completed these steps, reboot the system with the reboot command.