Displaying the hardware clock | LinuC Level 1 102 Exam original practice question

1.09.1Basic

Display the RTC value without changing the system clock or hardware clock.

Which command is appropriate?

Hint 1: Focus on clock layers

Separate the system clock, RTC, timezone rules, and NTP synchronization before comparing the commands or settings.

Hint 2: Key terms

Review the short definitions of system clocks, RTC, timezones, and NTP synchronization involved.

RTC: A hardware clock that retains time while the system is powered off.
hwclock: A command that reads the RTC or copies time between the RTC and system clock.
--show: The hwclock option that reads and displays the RTC value.
--systohc: The hwclock direction that writes the system clock into the RTC.
--hctosys: The hwclock direction that copies the RTC value into the system clock.

Detailed explanation

Incorrectdate

Incorrect. date displays the kernel system clock.

Correcthwclock --show

Correct. --show reads the hardware clock.

Incorrecthwclock --systohc

Incorrect. --systohc writes the system clock to the RTC.

Incorrecthwclock --hctosys

Incorrect. --hctosys copies the RTC into the system clock.

An example you can run in a temporary verification environment.

hwclock --help | grep -E -- '--show'

hardware clockを表示する説明行

Foundation review

The kernel-maintained time used by applications and timestamps.

The battery-backed hardware clock used to seed time during boot.

A process that compares a clock with remote time sources and corrects drift.

Question IDKL-102-1070

Environmentutil-linux hwclock help / RTCアクセスなし

Last technical review2026-08-13

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