Displaying a one-time process snapshot | LinuC Level 1 101 Exam original practice question

1.01.4Basic

List all current processes once with UID, PID, parent PID, start time, and command.

Which command is appropriate?

Hint 1: Focus on the requirement

The requirement is one full snapshot, not an interactive monitor or a shell-only job list.

Hint 2: Key terms

Review the short definitions before comparing the process and job-control choices.

ps: A command that reports process information at the time it is run.
-ef: A common ps combination for all processes in full System V format.
Process snapshot: A point-in-time view that does not refresh continuously.
PPID: The parent process identifier recorded for a process.

Detailed explanation

Incorrecttop -f

Incorrect. top is an interactive continuously updating monitor.

Incorrectjobs -ef

Incorrect. jobs is a shell job command and does not use -ef for all processes.

Incorrectpgrep -ef

Incorrect. pgrep searches matching process IDs rather than displaying a full listing.

Correctps -ef

Correct. ps -ef produces the requested one-time full process snapshot.

An example you can run in a temporary verification environment.

ps -ef | head

process一覧の先頭部分

Environment: procps-ng系ps
Use a disposable process or test shell when checking lifecycle commands.
Exact output and option names can vary slightly by distribution and tool version.

Foundation review

ps provides a point-in-time view; top is intended for repeated interactive observation.

Choose the ps option style deliberately because BSD and System V forms use different syntax conventions.

Question IDKL-101-360

Environmentprocps-ng系ps

Last technical review2026-08-13

More practice in this area