Cron & Scheduled Tasks Quick-Reference Kit for Linux Sysadmins
Master cron, systemd timers, and at jobs in one printable reference — syntax cards, real-world job examples, and a safety checklist so you never fat-finger a production schedule again.
- ▸Cron Syntax Reference — five-field diagram, operators, special strings, environment variables, crontab management commands, and output redirection
- ▸systemd Timers Reference — timer unit templates, OnCalendar syntax, enable/start/status commands, and a side-by-side cron vs. systemd comparison table
- ▸at & batch Reference — time spec syntax, queue management, access control, and when to reach for at instead of cron
- ▸20 Real-World Job Examples — 10 cron, 5 systemd timer, 5 at; every example is annotated with inline comments explaining non-obvious choices, including the correct secure credential pattern for database dumps
- ▸Production Safety Checklist — 12-item pre-deploy checklist covering every documented failure mode, with a sign-off form
- ▸Troubleshooting Quick-Reference — decision tree, root-cause table with diagnosis commands and fixes, log locations by distro, and a verification cheat sheet
- ▸Customer README — format declaration, 3-step usage guide, and optional PDF rendering instructions
$12
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