Run grep denied /var/log/auth.log | tee lab/redacted-auth.txt.
grep denied /var/log/auth.log | tee lab/redacted-auth.txt
Mission 251
Log redaction note
Capture evidence without copying more than needed.
Security administrationgrepteewc
Lesson 251 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 wc -l lab/redacted-auth.txt.
wc -l lab/redacted-auth.txt
Run printf redaction-reviewed > lab/redaction-note.txt.
printf redaction-reviewed > lab/redaction-note.txt
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Lesson support
What to notice while you play.
Capture evidence without copying more than needed.
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.
wc [-l] <file>
Count lines, words, and characters.