Inspect the one process identified by TASK_PID with ps.
Show PID, nice value, kernel priority, and command name in that order using procps-ng ps.
Which command is correct?
ps -o selects output columns. ni is the nice value, pri is the displayed scheduling priority, and comm is the short command name.
Detailed explanation
ps -p "$TASK_PID"Incorrect. It selects the PID but leaves the default columns and does not show the requested fields explicitly.
Incorrect. It selects the PID but leaves the default columns and does not show the requested fields explicitly.
ps -o pid=,ni=,pri=,comm= -p "$TASK_PID"Correct. It selects PID, NI, PRI, and COMMAND for the requested process.
Correct. It selects PID, NI, PRI, and COMMAND for the requested process.
nice -n "$TASK_PID" psIncorrect. nice starts a command with an adjustment; it does not inspect an existing PID this way.
Incorrect. nice starts a command with an adjustment; it does not inspect an existing PID this way.
renice "$TASK_PID"Incorrect. renice changes or reports priority rather than formatting the requested ps columns.
Incorrect. renice changes or reports priority rather than formatting the requested ps columns.
Try it yourself
An example you can run in a temporary verification environment.
ps -o pid=,ni=,pri=,comm= -p "$$"Expected result
現在のBashのPID、NI、PRI、bashを含む1行（空白幅とPRIは環境依存）Key points
- ni is the nice column
- pri is the priority column
- -o selects the columns
Notes
- Environment: procps-ng 4.x
- Command output formatting can vary slightly by distribution or tool version.
- Run the example in a temporary directory or process when possible.
Foundation review
Read the scope first
Check whether the command acts on the current shell, a new process, an existing process, or a file.
Verify the observable result
Use the supplied command and compare the output with the expected result.