A comprehensive automation skill for managing recurring tasks, systemd timers, and one-off scheduling across Linux and macOS environments.
Install & Download
1. ClawHub CLI
The fastest way to install a skill directly from the registry.
npx clawhub@latest install cron-scheduling
2. Manual Installation
Copy the skill folder to one of these locations
~/.openclaw/skills/ <project>/skills/ Priority: Workspace > Local > Bundled
3. Prompt Installation
Copy this prompt to OpenClaw to install it automatically.
Help me install cron-scheduling using Clawhub. If Clawhub is not installed, install it first (npm i -g clawhub).
Prefer to download?
Get the raw skill files in a ZIP archive.
What is Cron & Scheduling?
This skill provides a robust framework for scheduling and managing recurring tasks, bridging the gap between traditional cron syntax and modern systemd timers. It is designed for developers using Openclaw Skills who need to automate system maintenance, database backups, or periodic reporting with high reliability and precision.
By leveraging this skill, users can handle complex scheduling logic, including timezone-aware execution and Daylight Saving Time (DST) mitigation. It emphasizes operational excellence by providing templates for job monitoring, error alerting, and idempotent execution patterns, ensuring that background processes within Openclaw Skills environments remain stable and transparent.
Cron & Scheduling Use Cases
- Automating routine system maintenance like log rotation and temporary file cleanup.
- Scheduling critical data backups and periodic synchronization using rsync.
- Implementing modern systemd timers as a persistent alternative to legacy cron jobs.
- Debugging execution failures by simulating minimal environments and checking system logs.
- Running one-off delayed commands for automated deployments or notifications.
How Cron & Scheduling Works
- Define the task frequency using the standard five-field cron syntax or the systemd OnCalendar expression language.
- Create the execution script or command, ensuring all binary paths are absolute and environment variables are explicitly declared.
- Register the schedule by updating the user crontab or deploying systemd service and timer unit pairs.
- Apply concurrency controls using flock to prevent overlapping runs for long-running processes.
- Monitor execution through redirected logs or journald and verify schedule accuracy using systemd-analyze calendar tools.
Cron & Scheduling Setup
Ensure that your system has the necessary binaries available: crontab, systemctl, or at. These are standard on most Linux and macOS distributions used with Openclaw Skills.
# Check if cron service is active
systemctl status cron
# List active systemd timers
systemctl list-timers
# Test a calendar expression before deployment
systemd-analyze calendar "daily"
Cron & Scheduling Data Schema & Taxonomy
The skill manages task metadata and execution history through several system-level schemas:
| Data Type | Storage Location | Purpose |
|---|---|---|
| Crontab Entries | /var/spool/cron/ |
Stores user-defined schedules in 5-field syntax. |
| Systemd Units | /etc/systemd/system/ |
Defines service logic and timer-based triggers. |
| Task Logs | /var/log/syslog or /var/log/cron |
Records execution attempts and daemon activity. |
| Lock Files | /tmp/*.lock |
Managed by flock to ensure process mutual exclusion. |
Cron & Scheduling Advanced Features
- Systemd integration for resource limiting (CPUQuota, MemoryMax) and dependency-aware scheduling.
- Persistent timers that catch up on missed runs after a system reboot.
- Timezone-specific execution settings using the TZ environment variable in crontabs.
- Custom monitoring wrappers that provide structured logging, execution timing, and failure alerts.
- Idempotent script patterns that allow for safe re-runs during DST transitions or manual restarts.
SKILL.md
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