XK0-006 System Management Practice Question
An administrator wants to change the priority of a running process with PID 1234 to a lower priority (nicer). The current nice value is 0. Which command will set the nice value to 10?
⚠ Common exam trap
The Linux+ exam often tests the distinction between `renice` (for running processes) and `nice` (for launching a new process with a modified priority), and candidates may confuse `renice` with `nice` or think `kill` can change priority via signal numbers.
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
✓
renice 10 -p 1234
The `renice` command is used to alter the scheduling priority of an already running process. By default, a process starts with a nice value of 0. Running `renice 10 -p 1234` sets the nice value to 10, which is a lower priority (more 'nice') because the kernel adds this value to the dynamic priority calculation, giving the process less CPU time.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
renice 10 -p 1234
Why this is correct
renice alters the nice value of an already-running process identified by PID, so renice 10 -p 1234 raises niceness from 0 to 10, lowering scheduling priority. The -p flag specifies the target PID, satisfying the requirement to change a running process rather than launch a new one.
- ✗
nice -n 10 kill 1234
Why it's wrong here
The nice command launches a new process with an adjusted niceness; it cannot retarget an already-running PID, and kill only signals processes. To change a running process, renice -n 10 -p 1234 is required. The nice syntax is tempting because it correctly sets niceness values, but only at process creation.
- ✗
chrt -p 10 1234
Why it's wrong here
chrt sets scheduling policy and real-time priority, not the nice value; passing 10 would be interpreted as a priority for a scheduling class. It is tempting for priority changes, but adjusting niceness on a running process requires renice 10 -p 1234.
- ✗
kill -10 1234
Why it's wrong here
kill -10 sends signal 10 (SIGUSR1) to the process rather than altering its nice value, so the scheduling priority is unchanged. It is tempting because kill targets a running PID, but renice 10 -p 1234 is the command that sets niceness.
Go deeper
Related to this question
Learn chapter
Process Management and System Monitoring
Key term
Process
In IT service management, a process is a structured set of activities designed to accomplish a specific objective, such as managing incidents or changes, by transforming inputs into defined outputs.
Key term
Kernel
The kernel is the core program of an operating system that manages hardware resources and provides essential services for all other software to run.
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Written by Johnson Ajibi, MSc IT Security
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