LFCS Essential Commands Practice Question
A DevOps engineer wants to measure how long a specific command takes to execute. Which command should be used?
⚠ Common exam trap
Candidates often confuse `time` with `date` or `uptime` because they all display time-related information, but only `time` measures the execution duration of a specific command.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
time
The `time` command is specifically designed to measure the execution duration of a command, reporting real time, user CPU time, and system CPU time. It wraps the target command and tracks the elapsed wall-clock time and resource usage, making it the precise tool for benchmarking command performance.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
date
Why it's wrong here
Displays the current date and time.
- ✗
uptime
Why it's wrong here
Shows how long the system has been running.
- ✗
wall
Why it's wrong here
Sends a message to all logged-in users.
- ✓
time
Why this is correct
Measures the execution time of a command.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This LFCS practice question is part of Courseiva's free Linux Foundation certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the LFCS exam.