This EX200 practice question tests your understanding of essential tools. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 script needs to be run at system boot for a specific user. Which method ensures the script runs with that user's environment?
Place the script in /etc/rc.d/rc.local
Why wrong: rc.local runs as root, not as the user.
Add an entry to ~/.xprofile
Why wrong: This only runs when starting an X session, not at every boot.
Create a systemd user unit in ~/.config/systemd/user/
User units run with the user's environment and can start at login.
Add the script to the user's crontab with @reboot
Why wrong: @reboot cron jobs run as root by default, not as the user.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Create a systemd user unit in ~/.config/systemd/user/
Option C is correct because systemd user units, placed in ~/.config/systemd/user/, are executed in the user's own session context, inheriting the user's environment variables, PATH, and D-Bus session. This ensures the script runs with the specific user's environment at boot, as systemd starts the user manager (systemd --user) early in the boot process for each enabled user.
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.
Place the script in /etc/rc.d/rc.local
Why it's wrong here
rc.local runs as root, not as the user.
Add an entry to ~/.xprofile
Why it's wrong here
This only runs when starting an X session, not at every boot.
Create a systemd user unit in ~/.config/systemd/user/
Why this is correct
User units run with the user's environment and can start at login.
Related concept
Read the scenario before looking for a memorised answer.
Add the script to the user's crontab with @reboot
Why it's wrong here
@reboot cron jobs run as root by default, not as the user.
Common exam traps
The trap here is that candidates often assume @reboot in crontab runs with the full user environment, but in reality cron provides a stripped-down environment (e.g., no D-Bus, no systemd user session), making it unsuitable for scripts that depend on user-specific services or graphical session variables.
Detailed technical explanation
Systemd user units leverage the systemd --user instance, which is spawned by the systemd user manager (user@.service) and runs in a dedicated cgroup with its own environment. This allows services to start at boot even before the user logs in, using the 'WantedBy=default.target' directive, and they inherit the user's environment from the user manager's context, including variables set in ~/.config/environment.d/*.conf. A real-world scenario is running a user-level backup script that needs access to the user's SSH keys and $HOME directory without requiring an interactive login.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
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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: Create a systemd user unit in ~/.config/systemd/user/ — Option C is correct because systemd user units, placed in ~/.config/systemd/user/, are executed in the user's own session context, inheriting the user's environment variables, PATH, and D-Bus session. This ensures the script runs with the specific user's environment at boot, as systemd starts the user manager (systemd --user) early in the boot process for each enabled user.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
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