change username and email in git code example

Example 1: git config username

$ git config --global user.name "John Doe"
$ git config --global user.email [email protected]

Example 2: git user email

git config --global user.name "John Smith"
git config --global user.email "[email protected]"

Example 3: git change email

git config --global user.email "[email protected]"

Example 4: change git username and email

$ git config --global user.email "[email protected]"