Something

#!/bin/bash -x

echo "set-up panels"
pkill xfce4-panel 
rm -rf ~/.config/xfce4/panel
cp -r panel/ ~/.config/xfce4/panel
nohup xfce4-panel

exit

---------------------
./xfce4-panel.sh
+ echo 'set-up panels'
set-up panels
+ pkill xfce4-panel
Terminated