What is File vs !File in Ruby

What is !File in Ruby?

I was able find "File" in the documentation but not "!File".

 
if !File.directory? real_dir 	

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is an example of it and I don't know if it simply means "opposite" of File or...
Mark_CoAsked:
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GaryCommented:
It's called a NOT operator i.e. condition must be false

http://www.tutorialspoint.com/ruby/ruby_operators.htm
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Paul JacksonSoftware EngineerCommented:
! is a logical NOT operator so when you put it in fromt of anything you are checking for the opposite of it.

http://www.tutorialspoint.com/ruby/ruby_operators.htm
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Mark_CoAuthor Commented:
Ok, that's what i was thinking. I just didn't see it in the documentation so I figured it had to be something so simple.
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