>On Mon, 6 Sep 1999, Nevena Soskic wrote:
>
>> Hi
>>
>> We would like for listserv to compare two or more lists and extract all
>> the duplicate e-mail addresses found on these lists. What I would like
>> to ask is can we get listserv to de-dupe across lists?
>>
>> I also have another question.
>>
>> When I send the following command to listserv: REVIEW LISTNAME SHORT
>> NOHEADER BY COUNTRY, I receive list membership numbers by country. The
>> question I would like to ask in relation to this is how does listserv
>> determine where an e-mail address has come from? Is it by the .com or
>> .co.uk, for example, or is it determined by gateway?
>
>I do not know if Listserv has this feature, but if it doesn't, its easy to
>simulate. You just set up a dummy list then write a little script in the
>programming language of your choice to read the first list then quietly
>subscribe those who are subscribed to that list to the dummy list. Repeat
>this for each list you have in mind. Listserv will tell you if a
>subscription has already been added to the list in its output messages.

Note that LISTSERV considers [log in to unmask] and [log in to unmask]
to be distinct (as the relevent RFCs allow them to be distinct).  Since
very few, if any, sites actually allow email accounts to differ only by
case, you may wish to have the script first transform all the email
addresses to ALL CAPS.

Also, make sure that you're doing quiet adds unless you want everyone to
get a welcome message.

-jwgh

--
"I used to put in at least eleven--from eleven to fifteen hours a
day [practicing]."
         - Charlie Parker (January 1954)