Signals

Processes talk by sending signals.

In this interactive Linux lesson from Stencel Academy you don't just read — you type real commands like kill -TERM 5120, kill -9 5121 and watch the machine respond on a live, animated map. It is part of the free How Linux Works course.

Before this lesson

Builds on: Process States.

What you'll practise

• kill -l — List every signal and its number.
• pkill worker — Signal by name instead of PID.
• kill -0 5120 — Send no signal — just check the process exists.

Terms you'll learn

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