View uncommitted changes to a specific file with git

Question

How do I see uncommitted changes that have been made to a specific file with git? I have tried

git diff

but I get all of the changes of the entire repo. When I tried

git diff <filename> 

I got

fatal: ambiguous argument 'style1.css': unknown revision or path not in the working tree. Use '--' to separate paths from revisions

so then I tried

git diff -- <filename>

with the same result.

Answer 1

Turns out the file was in a directory that I didn't expect and the error message was correct. This works as expected.

git diff </path/and/file/name>