gitの ".." と "..." の意味がコマンドで異なるらしいので図解した

いわゆるダブルドットとトリプルドット。

履歴が1本

図解

コマンド

git log

$ git log master..test
C

$ git log master...test
C

$ git log test..master

$ git log test...master
C

git diff

$ git diff master..test
+C
 B
 A

$ git diff master...test
+C
 B
 A

$ git diff test..master
-C
 B
 A

$ git difftest...master

履歴が分岐

図解

コマンド

git log

$ git log master..test  --> git log ^master test
C

$ git log master...test --> git log master test ^B
D
C

$ git log test..master --> git log ^test master
D

$ git log test...master --> git log test master ^B
D
C

git diff

$ git diff master..test  --> git diff master test
-D
+C
 B
 A

$ git diff master...test --> git diff B test
+C
 B
 A

$ git diff test..master  --> git diff test master
-C
+D
 B
 A

$ git diff test...master --> git diff B master
+D
 B
 A

まとめ

• git logは範囲を指定
• git diffは2点を指定