comparison of files

[Chris Pressey]

On Tue, 16 Dec 2003 16:31:22 -0500 (EST)
"Brent Bailey" <mrb at bmyster.com> wrote:

> hello,
> 
> I have been trying to write a shell script that will compare 2 files
> and generate a 3rd.
> 
> i have a list of abusive IP's generated by our router. I want to
> compare it against a list of known abuse IPs ..and have it create a
> file of repeat offenders.
> 
> ive tired to use "comm" to compare file1 against file2 doing something
> like
> 
> comm -12i file1 file2 >file3
> 
> however it doesnt seem to work....any suggestions ?

Are file1 and file2 sorted?

-Chris