What exactly does the "u" do? "git push -u origin master" vs "git push origin master" - Stack Overflow

What exactly does the "u" do? "git push -u origin master" vs "git push origin master" - Stack Overflow

git push -u origin master  

Is the same as:

 git push origin master ; git branch --set-upstream master origin/master  

Do the last statement if you forget the -u!

Read full article from What exactly does the "u" do? "git push -u origin master" vs "git push origin master" - Stack Overflow