How to compare two text files

[W.H. Kalpa Pathum]

On Thu, May 6, 2010 at 6:32 PM, Terry Polzin <foxec208 at wowway.com> wrote:
> On Thu, 2010-05-06 at 18:27 +0530, W.H. Kalpa Pathum wrote:
>> hi,
>>
>> I've got two text files containing email addresses one at a row. The
>> number of rows in one file is different from the number of the other
>> file. email addresses in one file is already there in the other file
>> (there are some more also). What I want to do is extract the list
>> which is not in the other file.
>>
>> elaboration
>>
>> File A has 100 email addresses and file B has 15 email addresses. 15
>> email addresses in file B are already there in file A. I want to
>> extract the 85 mails (excluding the 15 from file B) from file A.
>>
>> Any idea on how to accomplish this?
> diff -b file_a file_b
nope it didn't help. it lists all rows in file A and then all rows in
file B. What I want is to list rows in File A excluding the rows
similar to those are in File B
>
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W.H.Kalpa Pathum
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