You want to count how many lines in data.txt contain the word 'error' ignoring case, using stdin redirection. Which command achieves this?

hard📝 Application Q15 of 15

Linux CLI - Pipes and Redirection

You want to count how many lines in data.txt contain the word 'error' ignoring case, using stdin redirection. Which command achieves this?

Awc -l < grep -i 'error' data.txt

Bgrep -i 'error' < data.txt | wc -l

Cgrep 'error' > data.txt | wc -l

Dgrep -i 'error' > data.txt | wc -l

Step-by-Step Solution

Solution:

Step 1: Use grep with case-insensitive option and stdin redirection
grep -i 'error' < data.txt reads data.txt ignoring case.
Step 2: Pipe output to wc -l to count matching lines
Adding | wc -l counts the number of lines output by grep.
Final Answer:
grep -i 'error' < data.txt | wc -l -> Option B
Quick Check:
Use grep -i with < and pipe to wc -l [OK]

Quick Trick: Pipe grep output to wc -l for counting lines [OK]

Common Mistakes:

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