Run lsof -i.
lsof -i
Mission 132
Open files and listeners
Use lsof to relate sockets to services.
Server operationslsofss
Lesson 132 of 360
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Server operations · 8 minutes
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learner@clairos:/home/learner $
Unix ops lab: type a command, press Enter
Instructions
8 minutes
Click any instruction for the command details, the why, and the common mistake to avoid.
Run ss -tulpn.
ss -tulpn
Run pgrep sshd.
pgrep sshd
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Lesson support
What to notice while you play.
Use lsof to relate sockets to services.
Run the commands in order and compare the outputs.
Junior operators build confidence by gathering evidence before changing systems.
- Skipping the inspection step.
- Assuming one command tells the whole story.
Reference
Commands in this lesson.
lsof
Show simulated files and sockets opened by services.
ss|ip
Inspect simulated sockets and addresses.
ssh|scp|ssh-keygen
Practice SSH inspection and dry-run transfer shapes without network access.