Run man grep.
man grep
Mission 302
Option reading drill
Use help output before applying search options to a log.
Terminal basicsmangrephistory
Lesson 302 of 360
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Terminal basics · 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 history.
history
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Lesson support
What to notice while you play.
Build repeatable confidence with checking command options before using them.
Start with man grep, inspect the result, then continue in order.
Checking command options before using them helps operators explain what they know before they change anything.
- Skipping the output that proves checking command options before using them.
- Changing several things before recording a baseline.
Reference
Commands in this lesson.
man <command>
Read a short educational manual page.
grep [-i] <text> <file>
Find literal text inside a file.
history
Show recent commands.