This gem provides an application, path_editor, which makes it easy to add, remove, display or clean up the Windows System and User PATH variables. Note this does NOT any transient variables active in the current process - it only affects those which are stored in the registry and set before each process begins. It's a nice alternative to using "Computer / Properties / Advanced" for updating environment variables.
commandline >= 0.7.10
highline >= 1.2.3