You should still be able to move the backups you made back in using Finder, even if you've messed up your command line tools. Remember that you can use Go -> Go To Folder... in Finder to go to any folder on your system, even if it's hidden. All that said, if you're going to mess around with putting your own command line commands in OS X, in the future, you should just make some other directory for them and add it to your PATH. I normally just laugh at people who've messed up in the way you claim to have.