open.rb

path = File::expand_path ARGV.shift
scpt = <<SCPT
tell application "Finder"
  activate
  select POSIX file "#{path}"
end tell
tell application "System Events"
  tell process "Finder"
    keystroke "y" using {command down, option down}
  end tell
end tell
SCPT
system("osascript -e '%s'" % scpt)