The best answer I can give you here is that Oracle files/directories will be where you (or whoever installed Oracle) put them when Oracle was first installed. You may want to consider keeping (printing out) a copy of the install log created when Oracle is installed so you have a list of those directories etc. Also, if you follow Oracle standards and don't change anything during the initial install, you should be able to get info on where directories are created etc in your operating specific Oracle admin/install guide.
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