Move tracked files in git into a particular directory

gistfile1.txt

$ mkdir rb
$ for i in `git ls-tree HEAD | cut -f2`; do git mv ${i} rb/; done

# Optional - undo the move for those that shouldn't have been moved
$ git reset HEAD {.gitignore,Procfile,requirements.txt,scripts,minions}
$ git checkout -- {.gitignore,Procfile,requirements.txt,scripts,minions}