How to compare a file on 2 different git remotes

I want to compare a file (main_co开发者_开发技巧ntroller.rb) on 2 different remotes (namely, production and staging) since I got different behavior on production and staging.

I believe the code (i.e. the file) is the same, but just wanted to be sure. But I can't figure out how to do this comparison in git.

Any help would be appreciated.

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Do you have both remotes set up in the same repo? I'll assume you do, and that they're called production and staging. There is a way to refer to a file in a specific commit/tree, and the syntax is treeish:path/to/file. You should be able to use this with git diff to say something like

git diff production:path/to/file staging:path/to/file