Typed something wrong in terminal: Need to undo?

I typed this in to unhide my Library folder:
chflags nohidden~/Library (leaving out a space by mistake)
and got this on the return:
usage: chflags [-fhv] [-R [-H | -L | -P]] flags file ...
Nothing appears to be wrong at the moment but I'm just nervous about messing in the terminal. I'm worried I've changed something I shouldn't have.
Can someone tell me what I did and what to type to change it back?
Thanks!
Message was edited by: dkrz

Hello:
I NEVER use terminal commands.  I am sorry to lecture (the lecture is more for others who might read the thread), but your post is a graphic example of why not to use terminal commands (unless you are very experienced at that level).  One minor error can cause serious problems.
In answer to your question, I do not know what you might have done nor how to fix it if something happened.
For future reference, you could have accomplished the same thing (making the home library folder visible) by clicking on "Go" in the Finder while holding the option key down.
Barry

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