How to show the changes in the last commit?

git show HEAD

commit 8cbc93b1adae11bd9d6e9c1d0f02fac945bb358f (HEAD -> main)

Author: Tom Ato

Date:   Thu Jun 3 16:45:52 2021 +0200

    Bye function

diff --git a/code.rb b/code.rb

index 82509d3..39a11a1 100644

--- a/code.rb

+++ b/code.rb

@@ -1,3 +1,3 @@

-def say_hello(name)

-  "Hello, #{name}"

+def say_bye(name)

+  "Bye, #{name}"

 end