LFCS Essential Commands Practice Question
Which TWO commands can be used to view the last 10 lines of a file and also follow new lines as they are written?
⚠ Common exam trap
Linux Foundation often tests the distinction between `tail -n 10` (static view) and `tail -f -n 10` (dynamic follow), and candidates may overlook the `-f` flag or confuse `head` with `tail`.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
tail -f -n 10
`tail -f -n 10` displays the last 10 lines of a file and then follows new lines as they are appended, using the `-f` (follow) flag. This is the standard way to monitor a log file in real time while initially showing the most recent 10 lines.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
tail -f -n 10
Why this is correct
Shows last 10 lines and follows.
- ✗
cat -n
Why it's wrong here
Shows entire file with line numbers.
- ✗
tail -n 10
Why it's wrong here
Shows last 10 lines but does not follow.
- ✗
head -n 10
Why it's wrong here
Shows first 10 lines.
- ✓
less +F
Why this is correct
Opens in follow mode like tail -f.
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