If you are missing your INIT.ORA configuration file and you have no backup, the only way to recover it is to manually re-create it. You can do this with any text editor on your system as this file is just a simple text file.
If you are using Oracle 9i or higher and using RMAN for your backups, then I suggest converting the INIT.ORA to the new SPFILE.ORA configuration file. RMAN can automatically back up this file for you, but cannot back up the INIT.ORA config file.
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