Finding Text with grep
grep searches for text and prints only the lines that match. Use grep pattern file.
>> appends a line instead of replacing the file. Notice grep apple skipped Apple pie: matching is case-sensitive. Add -i to ignore case, -n to show line numbers, -c to count matches, and -v to show lines that do not match.
Quick check
Which command shows the matching lines of `log.txt` that contain "error", in any letter case?
Your turn: write the code
app.log is created for you. Print only the lines that contain ERROR.
Finish the quick check (and any code exercise) to complete this lesson, or mark it done yourself.
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