/etc/rc. Local setting UI program startup and self startup

         And Windows Different ,Linux The desktop system of is just a software running on the kernel （Windows The desktop is integrated with the kernel ）, It is no different from other software . The desktop software is opened when the user logs in with the desktop , therefore Linux Under the UI The program must open the account on the desktop to have permission to open .

Set up UI There are many scripts for program startup , For example, use in desktop settings desktop、 Write a self starting service by yourself 、 utilize Linux Scheduled tasks, etc , Here we discuss the use of /etc/rc.local The plan .

 /etc/rc.local Script is the last script opened when the system starts , Permissions are root, If you want to start UI The program first needs to switch users .

For example, my current desktop login user is pi, Turn on UI The script of the program is start.sh.

stay rc.local Add su - pi -c 'echo "pi"|sudo /home/pi/start.sh'

su - pi -c ' command '： In the single quotation mark is the start script command ;

sudo /home/pi/start.sh ：sudo Permission opening script ;

echo “pi” | ： towards sudo Pass the password , The password is pi;

ps:UI The program must run on the display , So remember to set the displayed device location in the startup script . Generally, set environment variables “export DISPLAY=:0.0”.