How do I get to the command line in Eclipse

What you are asking for is local terminal. There are several option for Eclipse Is there an Eclipse plugin to run system shell in the Console?

and you are lucky because there is great plugin for MacOS

UPDATE: there is new TM Terminal http://marketplace.eclipse.org/content/tcf-terminals for all OSes.

Terminal plug-in for Eclipse provides a command line view (= INSIDE Eclipse), at the moment Linux and Mac OS X only.

_{(source: developerblogs.com)}

In the Eclipse Menubar select Window->Show View-> Other

Find or type "Terminal" in the filter box

You should now see a Terminal view in the bottom pane. In the icon section for that bottom pane you'll see an icon that looks like a very stylized terminal window with a plus-sign on it.

Click it and select "New Terminal Connection in current view", and then use the resulting dialog to create either a telnet or ssh connection to "localhost" depending on what you have available on your local system.

This works on Eclipse Indigo Java EE edition, with no additional plugins installed. I don't know if it was available in previous releases.

I use the Aptana Studio plugin and it provides Eclipse with a terminal utility opened this way:

Window -> Show View -> Terminal

I don't think Eclipse comes with a terminal out of the box. You can add command line arguments to Java programs:

Right Click -> Run As -> Run Configurations -> Run As -> Arguments

When you run Android apps from within Eclipse, it's really just Eclipse proxy-ingadb commands to the OS. With this in mind, even though I develop my Android apps in Eclipse, I manage the emulator from the outside using a plain old terminal, for increased speed and control.