Remote origin already exists error, how to fix?

Question

git

How to add a remote origin branch, and if it already exists, then do not add it, with one command?
+ what's the difference between:

• git remote add origin [email protected]
  
• git remote set-url origin [email protected]
  
• git remote set-url --add origin [email protected]
  

Answer 1

In my case, this error appeared due to the fact that this branch already existed and the url was the same.
Therefore, this "mixture" of two commands helped me:
That is, if the branch exists - just update the url, if not - then add it.
More information can be found here and here
What is the magic of >/dev/null 2>&1 read here