Alan Kay's answer to "Did the ENIAC have a BIOS"?

Cron jobs: the tiny line that runs half your backend

Every backend has a few jobs nobody looks at. The nightly backup. The 9 AM report. The script that deletes old files. Each one is a single line of cron. They work fine for months.

• Cron jobs are background code lines on Unix machines performing backups, reports, and deletions.
• Cron job syntax includes minute, hour, day of month, month, day of week, and command.
• Misunderstanding cron's range and interval syntax can lead to incorrect scheduling.

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From haze to heavy use: How often should you really be servicing your air-con?

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