当我尝试卸载时，我得到：
> sudo gem uninstall heroku
ERROR: While executing gem ... (Gem::InstallError)
heroku is not installed in GEM_HOME, try:
gem uninstall -i /usr/share/gems heroku
好的，我会试试：
> sudo gem uninstall -i /usr/share/gems heroku
Remove executables:
heroku
in addition to the gem? [Yn] Y
ERROR: While executing gem ... (Gem::FilePermissionError)
You don't have write permissions for the /usr/share/gems/bin directory.
我在这里不知所措。我需要做什么才能删除它？