In Linux, the 'at' command is used to: MCQ with Answer and Explanation

Question
In Linux, the 'at' command is used to:
A. Schedule a job to run once at a specified time
B. Schedule recurring jobs
C. Run jobs immediately
D. List scheduled jobs
Answer: Option A
Solution (By JKSSB Mock Tests)
at schedules one-time tasks; cron is for recurring jobs; atq lists pending at jobs.
This question belongs to: Computer Operating Systems
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Practice More Operating Systems Questions

Question #1
Which of the following represents the correct order of the standard process lifecycle states?
A. Running -> New -> Blocked -> Terminated
B. Blocked -> Ready -> Terminated -> New
C. Ready -> Terminated -> Running -> New
D. New -> Ready -> Running -> Terminated
Discuss
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Correct Answer: Option D

Explanation:
A normal process lifecycle generally progresses from its creation (New), placement in queue (Ready), actual execution (Running), to completion (Terminated).
This question belongs to: Computer Operating Systems
Question #2
What is the role of the Android 'Installed Packages' list in settings?
A. To view, manage, and uninstall apps
B. To update system firmware
C. To check app permissions
D. To clear app data
Discuss
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Correct Answer: Option A

Explanation:
The installed apps list allows users to see all applications, manage storage, uninstall, and force stop apps.
This question belongs to: Computer Operating Systems
Question #3
Which Linux command displays information about system processes in real-time?
A. ps
B. systemd
C. kill
D. top
Discuss
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Correct Answer: Option D

Explanation:
The 'top' command shows a dynamic, real-time view of running processes, CPU usage, memory, and more.
This question belongs to: Computer Operating Systems
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