Run GUI programs under cron, monitor root filesystem disk usage and send alarm.md

title	created	modified
Run GUI programs under cron, monitor root filesystem disk usage and send alarm	2024-06-19 06:26:15 +0000	2024-06-24 01:25:07 +0800

Run GUI programs under cron, monitor root filesystem disk usage and send alarm

the ultimate solution:

copy all current user environment variables to crontab.

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to run notify-send you have to set DBUS_SESSION_BUS_ADDRESS

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to run other gui programs you set DISPLAY and XAUTHORITY

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wall works for tmux and ssh sessions but not gnome-terminal.

in kde everything works fine. install konsole instead.

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script for monitoring disk usage:

#!/bin/bash

used_percentage=$(df / | awk 'NR==2 {sub(/%/, "", $5); print $5}')

alarm_message="Root filesystem has less than 10% free space."

# Compare the percentage with the number 90
if [ "$used_percentage" -lt 90 ]; then
    echo "Disk is ok."
else
    wall $alarm_message
    notify-send $alarm_message
fi