Can selfupdate be done incrementally

[Jeremy Lavergne]

> I also try to run selfupdate daily (one of my other machines is running
> Debian & a cron job kicks around 07:45 each morning to run apt-get
> update so, if I'm awake, I do Mac Ports too) so the number of ports is
> minimal on an upgrade & if I get a long list of ports, I split them into
> batches. Not necessary really but I like to keep the machine active on
> other fronts while they're upgrading as much as possible.

You can also set MacPort's nice value to make it play nicer (from `man 5 macports.conf`):
     buildnicevalue
         Lowered scheduling priority (0-20) to use for make when building
         ports
         Default: 0

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