How to make an existing branch track a remote branch?

Question

I'm trying to track an exiting branch to a remote branch using --track or --set-upstream-to, but got the following error

$ git branch --track master origin/master
fatal: A branch named 'master' already exists.   
$ git branch --set-upstream-to master origin/master
fatal: branch 'origin/master' does not exist   

I checked SourceTree and found that it uses --set-upstream, but got the following warning

$ git branch --set-upstream master origin/master
The --set-upstream flag is deprecated and will be removed. Consider using --track or --set-upstream-to
Branch master set up to track remote branch master from origin.

Both --track and --set-upstream-to is not working, Am I missing something?

Answer 1

I think I got it, it will be as the following (used --set-upstream-to + remote name)

$ git branch --set-upstream-to origin/master
Branch master set up to track remote branch master from origin.