git user.name user.email到底是干嘛用的

1. 1.6 First-Time Git Setup

1. Your Identity

   The first thing you should do when you install Git is to set your user name and e-mail address. This is important because every Git commit uses this information, and it’s immutably baked into the commits you start creating:

   $ git config --global user.name "John Doe"//An quote is needed,because there is a space between John and Doe. 
   $ git config --global user.email [e-mail]