Is it possible to return the line available in FILE1 but not FILE2 in diff?

Peng Yu <[email protected]>
Newsgroups gmane.comp.gnu.utils.bugs
Message-ID <CABrM6wmEk1upRvsotiB+a-W51CisZ+mVMHJATd095Ze=fq88Sw@mail.gmail.com> 
Hi,

I just want to return the line available in FILE1 but not FILE2 in
diff. After I read the document, it seems that this is not possible.
Could anybody confirm whether this is true? If so, is there an
alternative tool that does this? Thanks!

-- 
Regards,
Peng
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