alert-bad-processes-user

#! /bin/bash

#----------------------------------------------------------------------
# Description: alert audibly and visually if there are CPU heavy
#              processes running
# if argument1 is set then alert audibly
#
# 2026-01-11 23:11:09 v1.0.1 - made `top` version agnostic
# 2019-10-16 21:31:20 fine tune for LXDM *only*
# 2025-01-02 05:25:38 turned it into a user script to be run from ~/.config/autostart; fixed top's no config invocation (no option yet, filed a bug report)
# 2025-01-03 05:25:38 now uses a standard audio file
#
# 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) 2016-2025 Artem S. Tashkinov  All rights reserved.
#----------------------------------------------------------------------

faudio=/usr/share/sounds/freedesktop/stereo/complete.oga
timeout=3	# visual cue for this number of seconds
threshold=60	# minimum CPU usage which is considered bad
volume=33	# audio notification volume
interval=5	# check for bad processes every X seconds

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
	env HOME=/dev/null XDG_CONFIG_HOME="" 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";
			}
		}
	}'
}

while :; do
	bad_processes=`processes`

	if [ -n "$bad_processes" ]; then

		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 &

		if [ -f "$faudio" -a -n "$1" ]; then
			paplay --volume=$((volume*65535/100)) "$faudio" &
		fi

	fi
	sleep $interval
done