Take a webcam shot and save it in the pictures directory. Depends on tenderlove's av_capture: `gem install av_capture`

av

#!/usr/bin/env ruby

require 'av_capture'
require 'pathname'

session = AVCapture::Session.new
dev = AVCapture.devices.find(&:video?)

dir = Pathname(File.expand_path("~/Pictures/av"))
Dir.mkdir(dir) unless dir.exist?

# If we've got an argument, use it as a filename suffix
suffix = "_#{ARGV[0]}" || ""
filename = dir + "#{Time.now.strftime('%Y-%m-%d-%H%M%S')}#{suffix}.jpg"

session.run_with(dev) do |connection|
  # The camera -- or my MBP's iSight, anyway -- seems to need half a second
  # or so to focus and set the correct exposure
  sleep 0.5

  File.open(filename, "w") { |f| f.write connection.capture }
end