Crucial Exams

CompTIA Linux+ XK0-006 (V8) Practice Question

While troubleshooting a Bash script, you notice the following lines executed from /home/student:

echo "START: $PWD"
(cd /tmp && export TEMP=$(mktemp))
echo "END:   $PWD"
echo "TEMP=[$TEMP]"

After the script finishes, the screen shows:

START: /home/student
END:   /home/student
TEMP=[]

Which explanation best accounts for this result?

  • cd fails inside a grouped command when combined with mktemp, so Bash ignored the directory change and variable assignment.

  • The commands inside parentheses ran in a child shell, so the directory change and exported variable disappeared when that child exited.

  • The export built-in automatically unsets variables created in a different directory, resetting both PWD and TEMP.

  • Parentheses only group commands for redirection; the output shown is actually caused by mktemp returning an empty string.

CompTIA Linux+ XK0-006 (V8)
Automation, Orchestration, and Scripting
Your Score:
Settings & Objectives
Random Mixed
Questions are selected randomly from all chosen topics, with a preference for those you haven’t seen before. You may see several questions from the same objective or domain in a row.
Rotate by Objective
Questions cycle through each objective or domain in turn, helping you avoid long streaks of questions from the same area. You may see some repeat questions, but the distribution will be more balanced across topics.

Check or uncheck an objective to set which questions you will receive.

Wipe Score
Bash, the Crucial Exams Chat Bot
AI Bot