Differencre between two text files to a third text file
 

Hi!
I want the difference of two text files(a.txt & b.txt) into a third text file(c.txt).
i.e. New or Differert rows of a.txt compared to b.txt

a.txt>
10128|10153|999999
10343|10153|000
10345|10153|3846
10351|10153|3846

b.txt>
10128|10153|999999
10343|10153|3853
10345|10153|3853
10349|10153|3853

c.txt should be like>
10343|10153|000
10351|10153|3846

I tried comm,but man says that the files have to be sorted in order to use comm. I dont want to sort the files.

Thanks in Advance

Try using this:

diff a.txt b.txt >> c.txt

That gives a lot of other information. I want only the rows from a.txt.
c.txt should have only this.

I don't understand why the third line of a.txt is not present in your c.txt of your opening post, because it is different from the third line of b.txt.