How do I take a steathy picture with my iSight camera from the command line? Is there a command line utility that allows me to take a picture from the built in camera?  Something like screencapture allows for, well, screen captures.

The reasoning for a command line tool is I would like for it to be stealthy, without a countdown or flash or other indication to the user that a picture is being taken.
Use imagesnap. It can be installed with brew install imagesnap or by downloading the binary from the website.

One use for it is to take series of snapshots:

while :; do
    imagesnap ~/Desktop/$(date +%y%m%d%H%M%S).png
    sleep ${1-1}
done


It doesn't crop images horizontally either. (Photo Booth changes the aspect ratio to 3:2.)