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In more UNIXy tradition, I'd say either pipe in a file, or pick the default.

That way people can use downloaded files too.

unfortunately using a simple pipe is not going to work, because you're also looking for user input, and you can't do both easily with stdin.

It’s possible to construct parallel (ish) pipeline processing in bash by using file descriptors above 2. See https://mywiki.wooledge.org/FileDescriptor . It’s part of why I always liked Ruby’s .tap() : https://medium.com/aviabird/ruby-tap-that-method-90c8a801fd6...