dmesg-notify

#! /bin/bash

#----------------------------------------------------------------------
# Description: show dmesg messages on the screen for modern Linux'es
#              Fined tuned for lxdm-session
#
# Author: Artem S. Tashkinov
# Created at: Tue 10 Dec 2019 03:29:57 AM
# Computer: localhost.localdomain
# System: Linux 5.4.2-zen2 on x86_64
#
# Copyright (c) 2019 Artem S. Tashkinov  All rights reserved.
#----------------------------------------------------------------------

icon=/path/to/icon_32x32.png
timeout=3   # visual cue for this number of seconds

nl='
'

journalctl -kf | while read -r line1; read -r -t 1 line2; read -r -t 1 line3; true; do

    test -n "$line2" && line1="$line1$nl"
    test -n "$line3" && line2="$line2$nl"

    pid_lxdm=`pidof lxdm-session`
    Xuser=0 # this might not work - needs to be tested
    test -z "$pid_lxdm" || Xuser=`ps -u --ppid "$pid_lxdm" | tail -1 | awk '{print $1}'`

    if [ -n "$Xuser" ]; then
        su "$Xuser" -c "DISPLAY=:0 notify-send --expire-time="${timeout}000" --icon="${icon}" 'Kernel message' '$line1$line2$line3' &> /dev/null" &
    fi

done