MacOSX can install and upgrade your favourite UNIX and Linux packages. The Darwin Ports project (http://darwinports.com/) was created to help in these tasks.
First we need to update the list of updates available on the internet:
$ sudo su - # /opt/local/bin/port -d selfupdate
Secondly, we update the already installed Darwin ports:
# /opt/local/bin/port upgrade outdated
This process might take a long while, depending on the amount of ports you have installed. But after this process, all the installed Darwin ports will be upgraded.
Finally, we can also install new packages using the port command:
# /opt/local/bin/port install mc