Linux CLI - Text Processing
You want to find all lines containing either 'error' or 'fail' in
system.log. Which command achieves this?You want to find all lines containing either 'error' or 'fail' in system.log. Which command achieves this?
hard📝 Application Q8 of 15
Step-by-Step Solution
Solution:
Step 1: Understand pattern matching for multiple words
Using-Eenables extended regex, allowing alternation with|to match 'error' or 'fail'.Step 2: Check other options
grep 'error fail' system.log and C search for the exact phrase 'error fail', and D inverts the match.Final Answer:
grep -E 'error|fail' system.log -> Option CQuick Check:
Use -E with | to match multiple patterns [OK]
Quick Trick: Use grep -E 'pattern1|pattern2' for OR matches [OK]
Common Mistakes:
- Searching for phrase instead of alternatives
- Using -v to invert unintentionally
- Not using -E for regex alternation
Master "Text Processing" in Linux CLI
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