Run sed s/denied/blocked/ /var/log/auth.log.
sed s/denied/blocked/ /var/log/auth.log
Lesson 112 of 360
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Text and logs · 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 grep denied /var/log/auth.log.
grep denied /var/log/auth.log
Run wc -l /var/log/auth.log.
wc -l /var/log/auth.log
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Lesson support
What to notice while you play.
Preview text replacement without editing a log.
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.
sed s/old/new/ <file>
Preview simple text substitutions.