Quick Answer
The correct answer is `env` because it displays all current environment variables, allowing you to check environment variables for ls colors directly. The `ls` command relies on the `LS_COLORS` variable to control color output; if this variable is missing, unset, or corrupted, colors will disappear. Running `env` pipes the entire environment to the screen, letting you quickly grep for `LS_COLORS` and confirm its value. On the Red Hat Certified System Administrator EX200 exam, this question tests your understanding of how shell environment variables influence command behavior—a common trap is reaching for `alias` first, but aliases only affect command syntax, not variable-driven features like color output. Remember that `env` shows the full environment, while `echo $LS_COLORS` only checks one variable; the exam expects you to know `env` for a broad diagnostic. Memory tip: think "env" as "environment view"—if colors break, env is the first check you make.
This EX200 practice question tests your understanding of essential tools. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A user complains that the 'ls' command no longer outputs colors. The administrator suspects a change in environment variables. Which command would help diagnose the issue?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "which command"
Why it matters: Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
set
Why wrong: Shows all shell variables, but not a focused diagnostic.
declare
Why wrong: Used to declare or display variables, not typical for troubleshooting.
env
Lists environment variables including LS_COLORS.
alias
Why wrong: Shows aliases, not environment variables.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
env
Option C is correct because the `env` command displays all current environment variables, which directly affect the behavior of commands like `ls`. The `ls` command uses the `LS_COLORS` environment variable to determine color output; if this variable is missing or altered, colors will not appear. Running `env` allows the administrator to inspect the current environment and identify if `LS_COLORS` has been changed or unset.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
set
Why it's wrong here
Shows all shell variables, but not a focused diagnostic.
declare
Why it's wrong here
Used to declare or display variables, not typical for troubleshooting.
env
Why this is correct
Lists environment variables including LS_COLORS.
Clue confirmation
The clue word "which command" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
alias
Why it's wrong here
Shows aliases, not environment variables.
Common exam traps
The trap here is that candidates often confuse `env` with `set` or `declare`, thinking all three show the same information, but `env` specifically shows only exported environment variables, which is exactly what affects child processes like `ls`.
Trap categories for this question
Command / output trap
Shows all shell variables, but not a focused diagnostic.
Detailed technical explanation
Under the hood, `ls` checks the `LS_COLORS` environment variable (which is set by `dircolors` based on `/etc/DIR_COLORS` or `~/.dircolors`) to determine color mappings for file types. If `LS_COLORS` is unset or empty, `ls` defaults to no color output unless the `--color` flag is explicitly used. In a real-world scenario, a user might source a script that unsets `LS_COLORS` or a system administrator might have changed the global profile, making `env` the quickest way to verify the current state of this variable.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the EX200 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Essential Tools — study guide chapter
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FAQ
Essential Tools — This question tests Essential Tools — Read the scenario before looking for a memorised answer..
The correct answer is: env — Option C is correct because the `env` command displays all current environment variables, which directly affect the behavior of commands like `ls`. The `ls` command uses the `LS_COLORS` environment variable to determine color output; if this variable is missing or altered, colors will not appear. Running `env` allows the administrator to inspect the current environment and identify if `LS_COLORS` has been changed or unset.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "which command". Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
This EX200 practice question is part of Courseiva's free Red Hat 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 EX200 exam.
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