[NTLUG:Discuss] Filtering a list with a list

[Robert Citek]

fgrep -v will work for small lists:

$ fgrep -v -f exclude.list source.list
user1 at domain.com
user2 at domain.com
user3 at domain.com
user4 at domain.com

For larger lists, you'll probably want to use join:

$ join -v 1 <(sort source.list ) <(sort exclude.list )
user1 at domain.com
user2 at domain.com
user3 at domain.com
user4 at domain.com

Regards,
- Robert

On Fri, Mar 6, 2009 at 7:36 PM, Daniel Hauck <daniel at yacg.com> wrote:
> I have a process that generates a list of valid email addresses for a
> system.  I would like to be able to filter that list by removing all
> entries that appear in an exclusion list.