Script to Display the RaspberryPi IP Addresses on Startup in the LCD dogl-128 Display. (rpi-gpio + rpi-dog128). add in /etc/network/interfaces at the end: post_up /usr/local/bin/display_ip_info.sh

display_ip_info.sh

#!/bin/bash
socket=/var/lib/gpiod/socket
set_backlight="LCD BACKLIGHT 30\n"
lcd_clear="LCD CLEAR\n"
lcd_start=${set_backlight}${lcd_clear}
lcd_show="LCD SHOW\n"
pos_x=0
pos_y=0
lcd_text_pre="LCD TEXT 8 "
if_count=0

IFSTATUS=`ifplugstatus | grep -v lo | grep -v unplugged |cut -d: -f1`

for interface in $IFSTATUS
do
  if_count=$(($if_count + 1))
  addr=`ip -4 addr list dev $interface | grep inet | awk '{print $2;}' | cut -d'/' -f1`
  iftext[$if_count]="$interface:"
  ifaddr[$if_count]="$addr"
done
lcd_out="${lcd_start}${lcd_text_pre}${pos_x} $pos_y Raspberry Pi Kicker\n"
pos_y=$(($pos_y + 8))
lcd_out="${lcd_out}${lcd_text_pre}${pos_x} $pos_y -------------------\n"
pos_y=$(($pos_y + 8))

if [ "$if_count" -ne "0" ]
then
  for i in `seq 1 $if_count`
  do
    lcd_out="${lcd_out}${lcd_text_pre}${pos_x} $pos_y ${iftext[$i]}\n"
    pos_y=$(($pos_y + 8))
    xp=$(($pos_x + 16))
    lcd_out="${lcd_out}${lcd_text_pre}${xp} $pos_y ${ifaddr[$i]}\n"
    pos_y=$(($pos_y + 8))
  done
fi

lcd_out="${lcd_out}$lcd_show"

echo -e $lcd_out | nc -U $socket