Quick Answer
The answer is `nice -n -10 /usr/local/bin/myservice`. This command is correct because the `nice` utility adjusts the CPU scheduling priority of a process at launch time, with lower nice values indicating higher priority; using `-n -10` (or equivalently `nice -10`) assigns a higher-than-default priority to the service from the moment it starts. On the CompTIA Linux+ XK0-005 exam, this question tests your understanding of process priority management, often appearing alongside `renice` for adjusting already-running processes—a common trap is confusing `nice` (for new processes) with `renice` (for existing ones). Remember that nice values range from -20 (highest priority) to 19 (lowest), and only root can set negative values. A simple memory tip: "Nice guys finish last—so a lower nice number makes your process less 'nice' and gets more CPU time."
This XK0-005 practice question tests your understanding of system management. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 systems administrator needs to ensure that a custom service runs with a specific priority on a Linux server. Which command should the administrator use to achieve this?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "which command"
Why it matters: Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
renice -10 -p 1234
Why wrong: renice changes priority of an existing process, not starting a new one.
ionice -c 2 -n 0 -p 1234
Why wrong: ionice sets I/O priority, not CPU priority.
nice -n -10 /usr/local/bin/myservice
nice runs a command with a modified scheduling priority.
chrt -r 99 /usr/local/bin/myservice
Why wrong: chrt sets real-time scheduling attributes, not standard priority.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
nice -n -10 /usr/local/bin/myservice
Option C is correct because the `nice` command adjusts the CPU scheduling priority of a process at launch time. Using `nice -n -10` sets a higher priority (lower nice value) for the new service, ensuring it runs with the specified priority from the start. This directly meets the requirement to run a custom service with a specific priority.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
renice -10 -p 1234
Why it's wrong here
renice changes priority of an existing process, not starting a new one.
ionice -c 2 -n 0 -p 1234
Why it's wrong here
ionice sets I/O priority, not CPU priority.
nice -n -10 /usr/local/bin/myservice
Why this is correct
nice runs a command with a modified scheduling priority.
Clue confirmation
The clue word "which command" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
chrt -r 99 /usr/local/bin/myservice
Why it's wrong here
chrt sets real-time scheduling attributes, not standard priority.
Common exam traps
The trap here is that candidates confuse `nice` (for CPU priority at launch) with `renice` (for adjusting an already running process) or `ionice` (for I/O priority), leading them to select an option that does not set the priority at service start.
Detailed technical explanation
The `nice` command uses a priority range from -20 (highest priority) to 19 (lowest priority), with the default being 0. A negative nice value increases a process's CPU time slice relative to others, but requires root privileges (or appropriate capabilities) to set. In practice, administrators often combine `nice` with `ionice` and `chrt` for fine-grained resource control, but for a simple CPU priority adjustment at service startup, `nice` is the correct tool.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the XK0-005 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
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
System Management — This question tests System Management — Read the scenario before looking for a memorised answer..
The correct answer is: nice -n -10 /usr/local/bin/myservice — Option C is correct because the `nice` command adjusts the CPU scheduling priority of a process at launch time. Using `nice -n -10` sets a higher priority (lower nice value) for the new service, ensuring it runs with the specified priority from the start. This directly meets the requirement to run a custom service with a specific priority.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "which command". Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
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