Wednesday, January 26, 2011

alternatives

The alternatives utility automates managing multiple programs with the same function.

For instance if you want to use qmail instead of the default sendmail, install qmail and then issue:

alternatives --install /usr/sbin/sendmail mta /var/qmail/bin/sendmail 50 --slave /usr/lib/sendmail mta-sendmail /var/qmail/bin/sendmail

There are more slave links to explore, but I think it works for the most part.

Then run alternatives --config mta to verify that qmail is the preferred choice.

To go back you can simply run the later command again and make a new choice.
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