Image Capture

Hi, Can someone point me in the right direction please.
I loaded Ubuntu precise onto the BBB and plugged in a Microsoft lifecam, I was able to see it with lsusb and it appeared on the list of /dev folder. I couldn’t get v42l to run and couldn’t find out how to install it. I then watched Derek Molloys video and decided to switch to Angstrom as v4l2 is supposed to be part of the distribution. The webcam appears at lsusb, but is not now on the /dev list. However I still cannot get v4l2 to run. It keeps reporting unrecognised command. Is there something I need to do to get v4l2 to work? I just want to capture a periodic still image from the camera, as I’m linking it to an alarm system.