Git: difference “git rebase origin/branch” VS “git rebase origin branch”

Question

Does anyone know what is the difference? Seems to me, it is the same. But when I run it, it didn\'t do the same thing:

git rebase origin/branch - ok rebases

Answer 1

git rebase  

is equal to

git checkout 
git rebase 

By default is HEAD.

[1] https://www.kernel.org/pub/software/scm/git/docs/git-rebase.html