check difference between two files in git code example

Example 1: how to see the difference between two files in git

# It compare file with previously commited file.
git diff HEAD <file>

Example 2: git diff between one file

Just specify your local branch1 or remote origin/branch2
git diff branch1 origin/branch2	#show diff referenced from second branch
git diff branch1 branch2 file.txt #show diff only between file.txt