UNIX for Dummies Questions & Answers

Hi everyone, I have 2 very large files (each file have about 600k lines) and I want to see which numbers in file1 are not in file2, I thought of doing a diff, however diff will also display the changes, instead of just adds and delete, this makes it very hard to sort out just the adds and deletes. Is there a better way?

Example
say I have original.txt is:
1
2
3
4
5
6
and my new.txt is
6
5
4
3
2
1

diff original.txt new.txt will give me. Ideally, I want this to show nothing, since everything in original.txt is in new.txt
1,4c1
< 1
< 2
< 3
< 4
---
> 6
6c3,6
< 6
\ No newline at end of file
---
> 4
> 3
> 2
> 1
\ No newline at end of file

Hi.

See man comm, noting that files will need be sorted first. Best wishes ... cheers, drl