Run grep denied /var/log/auth.log.
grep denied /var/log/auth.log
Mission 322
Three-stage evidence pipeline
Search, number, and limit log evidence in one bounded pipeline.
Text and logsgrepnlhead
Lesson 322 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 | nl.
grep denied /var/log/auth.log | nl
Run grep denied /var/log/auth.log | nl | head -n 3.
grep denied /var/log/auth.log | nl | head -n 3
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Lesson support
What to notice while you play.
Build repeatable confidence with building a readable multi-stage text pipeline.
Start with grep denied /var/log/auth.log, inspect the result, then continue in order.
Building a readable multi-stage text pipeline helps operators explain what they know before they change anything.
- Skipping the output that proves building a readable multi-stage text pipeline.
- Changing several things before recording a baseline.
Reference
Commands in this lesson.
head|tail [-n N] <file>
Read the beginning or end of a file.
grep [-i] <text> <file>
Find literal text inside a file.
nl [file]
Number lines from a file or supported text pipeline.