MacPort is very BSD(ish)

To install opensource applications in your MacOS -- all you need is just a single command! It is equivalent to BSD port and Linux package management.

Firstly, you need to install Xcode then follow by MacPort. Once done, execute your Terminal and install whatever software(s)
available in MacPorts.

To search for a program so called mpg123 (as an example)
port search mpg321

If you want to install mpg321; just type this..
sudo port install mpg321

To delete all intermediates files after installing ....
sudo port clean --all mpg321

To list all outdated packages that you have installed..
port outdated

To just upgrade only one particular application(example mpg321) ..
sudo port upgrade mpg321

To upgrade all outdated packages...
sudo port upgrade outdated

To uninstall program and its dependencies
sudo port -fp uninstall --follow-dependents mpg123