You want to monitor the last 15 lines of a growing log file app.log in real-time but only want to see the newest lines as they appear. Which command combination is best?

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Linux CLI - Viewing and Editing Files

You want to monitor the last 15 lines of a growing log file app.log in real-time but only want to see the newest lines as they appear. Which command combination is best?

A<code>head -n 15 app.log</code>

B<code>tail -n 15 app.log</code>

C<code>tail -n 15 -f app.log</code>

D<code>head -n 15 -f app.log</code>

Step-by-Step Solution

Solution:

Step 1: Understand the need to see last lines and follow updates
You want the last 15 lines and to watch new lines as they are added.
Step 2: Use tail with -n 15 and -f
tail -n 15 -f app.log shows last 15 lines and follows file changes live.
Final Answer:
tail -n 15 -f app.log -> Option C
Quick Check:
tail -n 15 -f = last 15 lines + live updates [OK]

Quick Trick: Use tail -f to follow file changes live [OK]

Common Mistakes:

Using head which shows start, not end
Omitting -f to follow updates
Using head -f which is invalid

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More Linux CLI Quizzes

You want to monitor the last 15 lines of a growing log file app.log in real-time but only want to see the newest lines as they appear. Which command combination is best?

Step 1: Understand the need to see last lines and follow updates

Step 2: Use tail with -n 15 and -f

Final Answer:

Quick Check:

Want More Practice?

Step 2: Use `tail` with `-n 15` and `-f`