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If you want to access your USB pendrive data through Terminal in Mac OS X just follow these commands:

1- Go to Root folder:

	cd /

2- Go to Volumes folder:

	cd Volumes

3- Look for your USB name within the list folder content:

	ls

4- Go to USB folder:

	cd USB_PenDrive_Name

Then, to eject your USB pendrive safely use the following command:

	hdiutil eject /Volumes/USB_PenDrive_Name

And if it is blocked somehow, you can force the ejection with:

	hdiutil eject -force /Volumes/USB_PenDrive_Name