Question 21 of 528

Transform data with filters and plugins →easyMultiple ChoiceObjective-mapped

Using the Head Filter in Ansible

This EX294 practice question tests your understanding of transform data with filters and plugins. Compare every option against the stated constraints before choosing — the best answer satisfies all requirements, not just the most obvious one. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.

A DevOps engineer needs to extract the first 10 lines of a log file and store them in a variable for further processing. Which Ansible filter should be used?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.

A
regex
Why wrong: regex filter is for regex matching and replacement, not for extracting lines.
B
first
Why wrong: first returns the first item of a list, not first lines of a multiline string.
C
slice
Correct. The `slice` filter with arguments (0,10) retrieves the first 10 elements from a list (e.g., lines from a file).
D
head
Why wrong: Incorrect. The `head` filter on a string returns the first N characters, not lines. To get lines, the string must first be split into a list, then `head` works; however, the question asks for a single filter, and `head` alone does not achieve the goal.

Full breakdown with real-world context →

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

✓

slice

Option C is correct because the `slice` filter in Ansible can be used to extract a portion of a list or string. When applied to a list of lines (obtained by splitting the file content), `slice(0,10)` returns the first 10 lines. While `head` also works on lists, it is not valid for strings when line extraction is needed, as it returns characters. The `slice` filter provides the necessary flexibility to specify a range, making it the most appropriate choice for this scenario.

Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

✗
regex
Why it's wrong here
regex filter is for regex matching and replacement, not for extracting lines.
✗
first
Why it's wrong here
first returns the first item of a list, not first lines of a multiline string.
✓
slice
Why this is correct
Correct. The `slice` filter with arguments (0,10) retrieves the first 10 elements from a list (e.g., lines from a file).
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
head
Why it's wrong here
Incorrect. The `head` filter on a string returns the first N characters, not lines. To get lines, the string must first be split into a list, then `head` works; however, the question asks for a single filter, and `head` alone does not achieve the goal.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap is that candidates might think `head` is the direct equivalent of the Linux `head` command, but in Ansible it works only on lists or strings (returning characters), not lines. The `slice` filter is more versatile for extracting a range of items from a sequence.

Detailed technical explanation

How to think about this question

The `head` filter is part of Ansible's Jinja2 template engine and works by slicing the input sequence: `head(10)` is equivalent to `list[:10]`. When applied to a multiline string (e.g., from `lookup('file', '/var/log/app.log')`), Ansible first splits the string into lines, then applies the filter. This is efficient for large logs because it avoids loading the entire file into memory if used with streaming lookups, though the `file` lookup does read the whole file. In real-world automation, this is often combined with `register` to capture output for conditional processing or alerting.

KKey Concepts to Remember

Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.

TExam Day Tips

Watch for words such as best, first, most likely and least administrative effort.
Review why wrong options are wrong, not only why the correct option is correct.

Key takeaway

Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

Real-world example

How this comes up in practice

A practitioner preparing for the EX294 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.

What to study next

Got this wrong? Here's your next step.

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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FAQ

Questions learners often ask

What does this EX294 question test?

Transform data with filters and plugins — This question tests Transform data with filters and plugins — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: slice — Option C is correct because the `slice` filter in Ansible can be used to extract a portion of a list or string. When applied to a list of lines (obtained by splitting the file content), `slice(0,10)` returns the first 10 lines. While `head` also works on lists, it is not valid for strings when line extraction is needed, as it returns characters. The `slice` filter provides the necessary flexibility to specify a range, making it the most appropriate choice for this scenario.

What should I do if I get this EX294 question wrong?

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

Are there clue words in this question I should notice?

Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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