Planned lessonJNR-048-L02

Processes and resources

On This Lesson 4 topics

This lesson is planned. The outline below lists the topics it will cover. The full lesson has not been published yet.

In this lesson

see what is running and how much it uses, and stop it safely.

A process is a running program with a PID (process id).
ps aux lists processes; top shows live use of CPU and memory.
free -h shows memory; df -h shows disk space; du -sh * shows folder sizes.
kill PID asks politely (SIGTERM); kill -9 PID forces (SIGKILL) and should be a last resort.
A full disk or out-of-memory state is a common cause of "the app just died".

Draft outline details

bash

ps aux | grep java
free -h
df -h
kill 4242

Which command shows free disk space?

Show answer

df -h.

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