Help, I accidentally renamed the system library

I really screwed up. Hope someone can help. I was attempting to copy my entire hard drive to an external drive. During the copy process I thought, "I should rename the library folder so I don't confuse the copied one with the original." Somehow doing so renamed the library on my mac too.
So, now I can't correct the name back to library, can't get any programs to start, and can't shut down or restart.
Does anyone have any suggestions on how to fix this? Option+click won't allow me to rename it. I can't open terminal to rename it that way. I really messed up.
Thanks,
Mike

Restart from an alternate system and rename it back. If you need to use the recovery partition, open the Terminal from the Utilities menu and run:
mv '/Volumes/volumename/foldername/' '/Volumes/volumename/Library/'
changing the path as needed.
(115958)

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Help, I accidentally renamed the system library

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