bash 4.2 will print literal tilde, which seems like least evil.

Re-use the case switch

The backslash was needed due to [bug on Jessie][2], but on all other
macnines I use this is printed, which is not desired.

  [1]: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=767655

On Debian Wheezy the tilde expansion is performed.  Suppress it
explicitly.

Taken from an [i3 forum answer][1] and edited to remove unnecessary info
(name@hostname and $HOME path)

  [1]: https://faq.i3wm.org/question/2481/how-to-show-cli-application-name-in-window-title/?answer=2482#post-id-2482

Now `rm -rf /var/tmp/bash-rv` would only disable the feature instead of
causing errors to be printed on each prompt.

Inclusion of "real" \033 seemed to work but confused readline when
working with long history lines

*   More intuitive file naming,
*   setup simplified,
*   setup is now in script (vs. diff file),
*   removed unnecessary exec mode.