if test -f "$HOME"/.gnupg/agent-info &&
      kill -0 `head -1 "$HOME"/.gnupg/agent-info | cut -d: -f 2` 2>/dev/null; then
   kill `head -1 "$HOME"/.gnupg/agent-info | cut -d: -f 2`
else
   echo GPG agent is not running >&2
fi