[mythtvnz] Help needed to restore database

[Paulgir]

I switched on my Myth box today to find that there were no recordings  
listed.Possibly this may be related to an optimize db cron job that was  
scheduled last night ,but I can not be sure of that.
I tried to restore a database back up from yesterday,but when I try  
mythconverg_restore.pl command I get command not found messages.
I have tried this from the ~$ prompt and from the /usr/share/mythtv$  
prompt.
Is they any other way I can do a db restore?