Scribbles for my bad memory

You probably know:

• git diff shows unstaged changes.
• git diff --cached shows staged changes.

But how do you see all changes in one go? Just use:

git diff HEAD

Here's the breakdown:

• git diff compares the working directory to the staged index. If nothing is staged, it's the same as git diff HEAD.
• git diff --cached compares the staged index to HEAD. It's a shortcut for git diff --cached HEAD.
• git diff HEAD (or git diff <commit/branch/tag>) compares your current working directory with the specified commit.