# Cron Scheduler

> Unix cron job scheduling reference. Covers cron expression syntax, crontab management, cron directories, output handling, lock files with flock, debugging, environment gotchas, and systemd timer alternatives.

- Skill: `bytesagain/cron-scheduler` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add bytesagain/cron-scheduler`
- Raw SKILL.md: https://api.skillmd.com/api/skills/bytesagain/cron-scheduler/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: bytesagain (https://skillmd.com/u/bytesagain)
- Updated: 2026-09-21
- Page: https://skillmd.com/skills/bytesagain/cron-scheduler

---


# Cron Scheduler Reference

Unix/Linux job scheduling.

## Commands

| Command | Description |
|---------|-------------|
| `intro` | Cron expressions, format |
| `management` | crontab, directories, output |
| `patterns` | Locking, debugging, systemd |