alert-bad-processes

#! /bin/bash

#----------------------------------------------------------------------
# Description: alert audibly and visually if there are CPU heavy
#              processes running
# if argument1 == 1 then alert audibly
# if argument2 == 1 then alert visually
#
# Mon Jan 11 23:11:09 2016 v1.0.1 - made `top` version agnostic
# Wed 16 Oct 2019 09:31:20 PM     - fine tune for LXDM *only*
#
# Author: Artem S. Tashkinov
# Created at: Mon Jan 11 18:54:14 2016
# Computer: localhost.localdomain
# System: Linux 4.4.0-ic64 on x86_64
#
# Copyright (c) 2016 Artem S. Tashkinov  All rights reserved.
#----------------------------------------------------------------------

faudio=/opt/kde3/share/sounds/KDE_Beep_ClockChime.wav
timeout=3	# visual cue for this number of seconds
threshold=75	# minimum CPU usage which is considered bad

nl='
'

processes()
{
#	doesn't work: shows the aggregated CPU usage which might be very low for long running processes
#	ps auxS | awk '{if ($3 > 80) for (i=11; i<=NF; i++) print $i" "}'

#	doesn't work: top version specific
#	HOME=/dev/null top -bn1 | tail -n +8 | awk 'BEGIN{ORS=""}{if ($9 > '$threshold') {print $9"%\t"; for (i=12; i<=NF; i++) print $i" "; print "\n"}}'

#	avoid using user's top settings
	HOME=/dev/null top -bn1 | \
	awk '
	BEGIN {ORS=""}
	{
		if ($0~/PID.*USER.*PR/) {
			for (i=1;i<=NF;i++) {
				if ($i~/CPU/) f_cpu=i;
				if ($i~/COMMAND/) f_cmd=i;
				found=1;
			}
		}
		if (found) {
			if ($f_cpu > '$threshold') {
				print $f_cpu"%\t";
				for (i=f_cmd; i<=NF; i++) {
					if ($i != "`-") # top 3.3 likes a tree structure
						print $i" ";
				}
				print "\n";
			}
		}
	}'
}

if [ "$1" = 1 ]; then
	if [ -n "`processes`" ]; then
		if [ -f "$faudio" ]; then
			aplay -q "$faudio" &
		elif eplay --version &>/dev/null; then
			play -q -n synth 0.5 sine &
		else
			echo -ne '\007' &
		fi
	fi
fi

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 [ "$2" = 1 -a -n "$Xuser" ]; then
	bad_processes=`processes`
	if [ -n "$bad_processes" ]; then
		su "$Xuser" -c "DISPLAY=:0 notify-send --expire-time="${timeout}000" --icon=/mnt/STORAGE/birdie/linux/new/Adwaita_32x32_dialog-warning.png 'Warning!' 'Detected > ${threshold}%:$nl$bad_processes' &> /dev/null" &
	fi
fi