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On Android you can install a Linux app and run it there. UX may be lacking. But add a BT keyboard and mouse and it ain't bad.

That’s really not what people understand as a “mobile” experience.

In that case best option is if this writes to files use Dropbox and another app that understands the format.

iOS has terminals too now, but of course sandboxed. You could install this in there, though, and no linux needed.