From owner-freebsd-questions  Thu Jan 31  9: 2:20 2002
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From: Robert Klein <RoKlein@roklein.de>
Reply-To: RoKlein@roklein.de
Organization: roklein.de
To: adrian kok <adriankok2000@yahoo.com.hk>
Subject: Re: compare two files
Date: Thu, 31 Jan 2002 19:04:41 +0100
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> But the diff also outputs the data of fileB
> I only need fileA data whether it exists to fileB

If your files are lexically ordered, maybe comm(1) is the tool you 
look for.  E.g. 

comm -23 fileA fileB

If your files are not ordered, you can do so, using sort(1) and 
perhaps uniq(1), too.  For example:

cat fileA | sort | uniq >fileA.2
cat fileB | sort | uniq >fileB.2
comm -23 fileA.2 fileB.2 >diff-file

Please look up the manpages for those commands for further 
information.

Robert

>  --- Joel Dinel <dinjo@touchtunes.com> wrote: 
> > It
> > already exists, and it's called 'diff'.
> > man diff
> >
> > On Thu, Jan 31, 2002 at 11:50:13PM +0800, adrian kok wrote:
> > > I would like to know how to write script or
> > program to
> > > compare two file
> > > two files: file1 and file2
> > > check data of file1 whether exists in file2
> > > if not
> > > write this data in file1 or output to file

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