change git username and email

C++
git config --global user.name "Your Name"
git config --global user.email "[email protected]"$ git config --global user.name "John Doe"
$ git config --global user.email [email protected] config user.name
git config user.emailgit config --global user.email "[email protected]"$ git config --global user.name
> "John Smith"

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

if you have configured multiple git users in your machine
$ git config --global user.name ### It will give name of git user who is globaly scoped
$ git config user.name ### It will give name of git user who has scope with respect to current repository
$ git config --global user.email "[email protected]"
Source

Also in C++: