From owner-freebsd-questions  Thu Jan 31  8:11:18 2002
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From: Wayne Pascoe <freebsd@molemanarmy.com>
To: adrian kok <adriankok2000@yahoo.com.hk>
Cc: freebsd-questions@FreeBSD.ORG
Subject: Re: compare two files
References: <20020131155013.82668.qmail@web21209.mail.yahoo.com>
Date: 31 Jan 2002 16:11:44 +0000
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adrian kok <adriankok2000@yahoo.com.hk> writes:

> 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
> 
> #!/bin/sh 
> $lista=fopen("a.txt", "r"); 
> $listb=fopen("b.txt", "r"); 
> 
> while(!feof($lista)) { 
> $dmbuffer = fgets ($lista); 
> grep $dmbuffer $listb > diff; 
> } 

I think that using diff might do what you want.

diff file1 file2 
this will print the lines in each file that differ to standard
output. This can be redirected to a file by doing
diff file1 file2 > differences


HTH

-- 
- Wayne Pascoe
                                 | Everything to excess. To enjoy the 
freebsd@molemanarmy.com          | flavor of life, take big bites. Moderation 
http://www.molemanarmy.com       | is for monks. - Robert Heinlein
                                 | 

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