Oracle gives the SQLLoader commandline utility. But it relies on a proper formatting of the data file.
You can try to look at Oracle External Tables (e.g. you can link a csv file as an external table and see it as a table within Oracle).
Both solutions have pros and cons, but the big cons is that they still rely on data input format (so if you have a file ready for mysql, you may need to tweak it a bit).
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