changing serial port permissions permanently

[nathanhurley]

Hi. I use the USB serial port to connect to routers, but everytime it reboots I have to change permission for /dev/ttyUSB0 and /dev/ttyS0.

How can I change this permanently so it has chmod 777 on reboot?

[SeijiSensei]

Add the command to the file /etc/rc.local, a script that runs after everything else that starts at boot. rc.local runs with root privileges, so you don't need sudo, just:

chmod 777 /dev/ttyS0
chmod 777 /dev/tty/USB0

[steeldriver]

Have you tried adding your user to the dialout group instead? it is sometimes sufficient for serial device connections