git diff 工作區與暫存區的差別
git diff -cached / git diff -staged 暫存區與版本庫的差別
git diff HEAD 工作區與版本庫的差別
git diff branch1 branch2 兩個分支的最新commit的差別
git diff branch1...branch2 自branch1與branch2分開以來，branch2上的變化
git diff --stat 檢視簡單的diff結果
git diff branch1 檢視當前目錄與另外一個分支的差別
git diff HEAD -- ./lib 顯示當前目錄的lib目錄和上次提交之間的差別
git diff HEAD^ HEAD 檢視上次提交與上上次提交的差別
git diff commit1 commit2 檢視兩次提交之間的差別