Scripting help

Matthew Seaman m.seaman at
Fri Jan 9 07:48:37 PST 2004

On Fri, Jan 09, 2004 at 09:19:37AM -0600, Jack L. Stone wrote:
> Dear list:
> I hope think this is not off-topic, and is just about running a script in
> FBSD to delete specific lines in a flat file based on info in another flat
> file.
> My scripting skills are very limited and need help on how to purge my mail
> lists. We maintain several majordomo mail lists on a Tech magazine site
> ( with 60,000 readers. Needless to say, it is real tedious
> to try and keep the lists up to date (groan).
> I have scripted a way to capture the bounces (by list) into a plain text
> file (1 address per line), but haven't figured out how to purge those from
> the lists. In other words, if the address is found in the bounce list, then
> delete from the main lists (also one address per line).
> I'd appreciate suggestions on how to do this.

comm(1) is what you need.  Try:

    % sort mailing-list > mailing-list.sorted
    % sort bounce-addresses > bounce-addresses.sorted
    % comm -23 mailing-list.sorted bounce-addresses.sorted > mailing-list


Dr Matthew J Seaman MA, D.Phil.                       26 The Paddocks
                                                      Savill Way
PGP:         Marlow
Tel: +44 1628 476614                                  Bucks., SL7 1TH UK
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