A Linux administrator needs to rename all files ending with '.txt' in the current directory to have a '.bak' extension. The admin writes a script with a for loop. Which loop correctly iterates over the files and performs the rename?

while read file; do mv "$file" "$file.bak"; done < *.txt

for file in *.txt; do mv $file ${file}.bak; done

for file in $(ls *.txt); do mv $file $file.bak; done

for file in *.txt; do mv "$file" "${file%.txt}.bak"; done

A script runs a critical command and needs to exit with an error message if the command fails. The admin writes: 'command' followed by 'if [ $? -ne 0 ]; then echo "Failed"; exit 1; fi'. However, the script always prints 'Failed' even when the command succeeds. What is the likely cause?

The script is missing a shebang, so $? is not updated.

The variable $? is overwritten by the echo command before the test.

The command is not found, so it always returns a non-zero exit status.

The test should use -eq instead of -ne.

A script is not behaving as expected; it seems to skip an if block even though the condition should be true. The admin wants to trace the execution to see what the script is actually doing. Which command should the admin use to run the script with tracing enabled?

chmod +x script.sh && ./script.sh

A script needs to store the number of lines in a file and then compare it to a threshold. The admin writes: 'count=$(wc -l < file.txt)' and then 'if [ $count -gt 10 ]; then ...'. The script works, but the admin wants to make the threshold configurable. What is the best approach?

Use a variable for the threshold, e.g., 'threshold=10' and compare with 'if [ $count -gt $threshold ]'.

Use command substitution to get the threshold from a file.

Hardcode the threshold in the if statement as it is currently.

Use an environment variable and export it before running the script.

A script must check if a user-provided argument is 'start', 'stop', or 'restart' and act accordingly. If the argument is anything else, it should print an error. Which conditional structure is most appropriate?

case "$1" in start) ... ;; stop) ... ;; restart) ... ;; *) echo "Invalid";; esac

if [ "$1" = "start" ]; then ... fi; if [ "$1" = "stop" ]; then ... fi; if [ "$1" = "restart" ]; then ... fi

if [ "$1" = "start" ]; then ... elif [ "$1" = "stop" ]; then ... elif [ "$1" = "restart" ]; then ... else echo "Invalid"; fi

if [ "$1" = "start" -o "$1" = "stop" ]; then ... fi

LPI Linux Essentials (010-160)

Domain 3Objective 3

3.3 Turning Commands into a Script (weight: 4) LINUX-ESSENTIALS Practice Questions (Page 7)

Part of the Topic 3: The Power of the Command Line domain, which makes up ~16% of our current practice bank. Linux Professional Institute does not publish an official question count, but from its 60-minute exam (~25–40 total, ~4–6 in this domain), expect 1–2 from this objective — we provide 36 practice questions to prepare you well beyond it. (estimate)

36questions here

8free pages

9concepts

Questions 31–35

31application · medium
A Linux administrator needs to rename all files ending with '.txt' in the current directory to have a '.bak' extension. The admin writes a script with a for loop. Which loop correctly iterates over the files and performs the rename?
Select an answer first
32application · medium
A script runs a critical command and needs to exit with an error message if the command fails. The admin writes: 'command' followed by 'if [ $? -ne 0 ]; then echo "Failed"; exit 1; fi'. However, the script always prints 'Failed' even when the command succeeds. What is the likely cause?
Select an answer first
33application · easy
A script is not behaving as expected; it seems to skip an if block even though the condition should be true. The admin wants to trace the execution to see what the script is actually doing. Which command should the admin use to run the script with tracing enabled?
Select an answer first
34application · easy
A script needs to store the number of lines in a file and then compare it to a threshold. The admin writes: 'count=$(wc -l < file.txt)' and then 'if [ $count -gt 10 ]; then ...'. The script works, but the admin wants to make the threshold configurable. What is the best approach?
Select an answer first
35application · medium
A script must check if a user-provided argument is 'start', 'stop', or 'restart' and act accordingly. If the argument is anything else, it should print an error. Which conditional structure is most appropriate?
Select an answer first

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