Run grep -i failed /var/log/auth.log.
grep -i failed /var/log/auth.log
Lesson 48 of 360
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Text and logs · 7 minutes
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learner@clairos:/home/learner $
Unix ops lab: type a command, press Enter
Instructions
7 minutes
Click any instruction for the command details, the why, and the common mistake to avoid.
Run grep root /var/log/auth.log.
grep root /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.
Use grep -i and counts to review log text.
Search for failed with -i.
Log sources do not always use consistent casing.
- Missing matches because case differs.
- Counting lines before filtering.
Reference
Commands in this lesson.
grep [-i] <text> <file>
Find literal text inside a file.
wc [-l] <file>
Count lines, words, and characters.