Cron & Task Scheduling (Cron/Systemd Timers/At)

Precision Scheduling with Systemd Timers

🧩 The Challenge

Traditional cron jobs often lack the ability to handle missed tasks if the system was powered down or provide detailed execution tracking.

💡 The Fix

Use systemd timers to decouple your task scheduling from the execution service, allowing for persistent state management and better integration with system logs.

systemctl edit –full my-task.timer
[Unit]
Description=Run my script daily

[Timer]
OnCalendar=daily
AccuracySec=1us
Persistent=true

[Install]
WantedBy=timers.target

⚙️ Why It Works

By setting Persistent=true, the system will trigger the task immediately upon boot if it missed its scheduled run time during a shutdown. AccuracySec allows you to define how strictly the system must adhere to the time, helping preserve CPU resources.

🚀 Pro-Tip: Use systemd-analyze calendar ‘daily’ to verify exactly when your timer expression will trigger next.

Linux Tips & Tricks | © ngelinux.com | 7/5/2026