Undo Some Command Line Editing

When using some of the fancy command line editing shortcuts, such as ctrl-u, you may end up erroneously changing or deleting part of the current command. Retyping it may be a pain or impossible if you've forgotten exactly what was changed. Fortunately, bash's command line editing has undo built in. Just hit ctrl-_ a couple times to get back to where you want to be.

h/t Chris Erin