On 19 Jul 1997 10:12:52 +0200 
 joda@pdc.kth.se (Johan Danielsson) wrote:

 > The easy way to do this is just to take the longest prefix common to
 > all messages in a mail. Anything more elegant would require more work,
 > disk-space, or bandwidth.

Well.. err... The prefix might not correspond to the majority of the
changes in that mail, for example... Hmm, I could just be misunderstanding
what you're suggesting...

 > If someone can tell me how this mail-batching stuff is done today, I
 > can write something to show what I mean.

Quite literally:

#!/bin/sh -e
#       $Id: rotate,v 1.6 1996/01/03 19:22:26 mycroft Exp $
[ -e commits.old ] || (
        [ -s commits ] || exit
        mv commits commits.old
        sleep 1
)
mail -s 'NetBSD master CVS tree commits' source-changes < commits.old
rm -f commits.old

...by default, all commits are logged like:

umask 002; (echo ""; echo $USER; date; cat) >> $CVSROOT/CVSROOT/commits

Jason R. Thorpe                                       thorpej@nas.nasa.gov
NASA Ames Research Center                               Home: 408.866.1912
NAS: M/S 258-6                                          Work: 415.604.0935
Moffett Field, CA 94035                                Pager: 415.428.6939