How to perform a text file diff in Git?

File

• Diff between the head commit of the current branch (HEAD) and the current file not yet committed (in the working area)

git diff HEAD myFile

Branch

Between the head of the main branch and the head commit of the current branch

git diff main..HEAD --summary
# Only deleted / renamed file
git diff main..HEAD --summary | egrep '(delete|rename)'

diff-index

diff-index ¹⁾ is a low level command that checks only file metadata (not the content)

Compare a tree to the working tree or index (staging area)

Example:

git diff-index --diff-filter=AM --name-only  HEAD

where:

• diff-filter filters is a sequence of short status
• name-only prints only the name