macPort usage

    sudo port selfupdate 
Running this command on a regular basis is recommended -- it ensures your

MacPorts installation is always up to date. Afterwards, you may search for ports to install:

        port search <portname>

where <portname> is the name of the port you are searching for, or a partial name.

To install a port you've chosen, you need to run the port install command as the Unix superuser:

        sudo port install <portname>

Reference
  man port