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

Question

Share Report Error

In Linux, the 'export' command is used to:

A. Make a variable global

B. Set environment variables that are passed to child processes

C. All of the above

D. Display environment variables

Answer: Option C

Solution (By JKSSB Mock Tests)

export makes shell variables available to subprocesses; without options, it lists exported variables.

This question belongs to: Computer Operating Systems

Request complete Subject PDF

Discuss this Question (0)

No comments yet. Be the first to start the discussion!

Practice More Operating Systems Questions

Question #1

Which Linux command is used to display the system's current runlevel?

A. runlevel

B. All of the above

C. who -r

D. systemctl get-default

View Answer & Solution Discuss

Get Complete Subject PDF for Computer

Correct Answer: Option B

Explanation:
runlevel and who -r show the current and previous runlevel; systemctl get-default shows default target.

This question belongs to: Computer Operating Systems

Question #2

In Windows, the 'Diskpart' command can be scripted using:

A. Batch files

B. All of the above

C. PowerShell

D. A text file with commands and 'diskpart /s script.txt'

View Answer & Solution Discuss

Get Complete Subject PDF for Computer

Correct Answer: Option B

Explanation:
diskpart supports scripts via /s, and can be used within PowerShell or batch files for automation.

This question belongs to: Computer Operating Systems

Question #3

What is the name of the software layer in Android that provides standard interfaces to expose device hardware capabilities to the higher-level Java API framework?

A. Android Runtime (ART)

B. Native C/C++ Libraries

C. Linux Kernel

D. Hardware Abstraction Layer (HAL)

View Answer & Solution Discuss

Get Complete Subject PDF for Computer

Correct Answer: Option D

Explanation:
The Hardware Abstraction Layer (HAL) defines a standard interface for hardware vendors to implement, enabling higher-level Android framework APIs to interact with hardware.

This question belongs to: Computer Operating Systems

Explore All Operating Systems MCQs