[Techtalk] finding added lines in a file

[Little Girl]

Hey there,

Miriam English wrote:

> Forgive my thickness. I've read (or attempted to read) the manual
> pages for diff, cmp, and comp and still can't work out how to list
> just the lines added to file B when comparing two files, A and B.
> Perhaps I can blame having just getting out of hospital after a
> bout with a mystery high fever, but I do remember having difficulty
> trying to work this out before too.

I hope you're feeling better!
 
> Anybody know the secret?
> 
>   - compare two files, A and B
>   - just print the additional lines of file B
> 
> It should be easy, right? I'm completely stumped.

I don't know how to do it with diff, cmp, or comp, but here it is
with comm:

comm -1 -3 <(sort A.txt) <(sort B.txt)

-- 
Little Girl

There is no spoon.