Run grep PermitRootLogin /etc/ssh/sshd_config.
grep PermitRootLogin /etc/ssh/sshd_config
Mission 140
Hardening summary
Summarize posture from logs, config, and service exposure.
Security administrationgrepsstee
Lesson 140 of 360
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Security administration · 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 printf hardening-reviewed | tee lab/hardening.txt.
printf hardening-reviewed | tee lab/hardening.txt
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Lesson support
What to notice while you play.
Summarize posture from logs, config, and service exposure.
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.
grep [-i] <text> <file>
Find literal text inside a file.
tee <file>
Write piped text to a lab file and keep it on screen.
ss|ip
Inspect simulated sockets and addresses.
ssh|scp|ssh-keygen
Practice SSH inspection and dry-run transfer shapes without network access.