Signals, and why kill -9 is the last resort
Choosing the right signal to stop a program, and knowing exactly what you give up when you fall back on kill -9.
20 minutesTechnical content last reviewed on 2 Aug 2026
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What this lesson builds
- Saying what an output proves, and what it leaves open
- Reading system state without over-reading it
- Running a service under systemd, from first start to automatic recovery