95
git diff mybranch master -- myfile.cs
git diff mybranch..master -- myfile.cs
86
git diff ..master path/to/file
75
git diff branch1name branch2name path/to/file
git diff mybranch/myfile.cs mysecondbranch/myfile.cs
git diff branch1:file branch2:file
git diff mybranch:myfile.cs mysecondbranch:myfile.cs
git diff ..someBranch path/to/file
git diff ..master myfile.cs
61
git diff $BRANCH -- path/to/file