LFCS Practice Test 2 — 10 Questions

Question 1

Based on the exhibit, which process will be affected if the root user runs 'kill 5678'?

Accepted Answer

The www-data process with PID 5678. The 'kill 5678' command sends the default SIGTERM (signal 15) to the process with PID 5678. Since the root user has the CAP_KILL capability and is not subject to the ordinary permission checks that restrict non-root users, root can send signals to any process, including those owned by www-data. Therefore, the www-data process with PID 5678 will be terminated.

Answer

The root process (PID 1234)

Answer

All www-data processes

Answer

No process, because root cannot kill www-data processes

Question 2

A system administrator needs to find all files in /var/log that have been modified in the last 7 days. Which command accomplishes this?

Accepted Answer

find /var/log -type f -mtime -7. Option D is correct because the `find` command with `-mtime -7` searches for files whose modification time (content change) is less than 7 days ago, which matches the requirement of 'modified in the last 7 days'. The `-type f` restricts the search to regular files, and `/var/log` is the target directory.

Answer

find /var/log -type f -atime -7

Answer

find /var/log -type f -ctime -7

Answer

find /var/log -type f -mtime +7

Question 3

A junior administrator needs to display the first 10 lines of a file named 'data.csv'. Which command should they use?

Accepted Answer

head data.csv. The `head` command is specifically designed to display the first 10 lines of a file by default. Running `head data.csv` will output the first 10 lines of the CSV file, making it the correct choice for this task.

Answer

less data.csv

Answer

tail data.csv

Answer

cat data.csv

Question 4

What is the purpose of the chmod 755 command in this exhibit?

Accepted Answer

Set permissions to rwxr-xr-x. The chmod 755 command sets the file permissions to rwxr-xr-x, meaning the owner has read, write, and execute permissions (7), while the group and others have read and execute permissions (5). This is a common permission set for executable scripts and directories to allow execution without granting write access to non-owners.

Answer

Add execute permission for the owner only

Answer

Remove write permission for others

Answer

Set the setuid bit

Question 5

A system administrator needs to check the current CPU load and memory usage on a Linux server. Which command should be used to display a dynamic, real-time view of running processes and system resource utilization?

Accepted Answer

top. Option B (top) is correct because it provides a dynamic, real-time view of running processes and system resource utilization, including CPU load, memory usage, and process details. It updates continuously by default, making it ideal for monitoring live system performance.

Answer

uptime

Answer

ps aux

Answer

free -h

Question 6

Which THREE of the following commands can be used to view the contents of a compressed file named 'file.gz' without permanently decompressing it? (Choose exactly three.)

Accepted Answer

zmore file.gz. Option B is correct because `zmore` is a utility that allows you to view the contents of a compressed file (such as `file.gz`) page by page without permanently decompressing it. It internally decompresses the file on the fly and pipes the output through `more`, making it ideal for inspecting large compressed files without modifying the original archive.

Answer

gzip file.gz

Answer

gunzip file.gz

Question 7

A developer accidentally deleted a critical file /var/log/app.log. The system administrator knows that the file was recently backed up using a cron job that runs 'tar -czf /backup/logs.tar.gz /var/log/'. Which command should the administrator use to restore the file from the backup without extracting the entire archive?

Accepted Answer

tar -xzf /backup/logs.tar.gz --to-stdout var/log/app.log > /var/log/app.log. Option C is correct because `tar -xzf` extracts the specified file (`var/log/app.log`) from the compressed archive and `--to-stdout` sends its content to standard output, which is then redirected to recreate the file at `/var/log/app.log`. This restores the single file without extracting the entire archive, matching the requirement precisely.

Answer

tar -xf /backup/logs.tar.gz var/log/app.log

Answer

tar -tf /backup/logs.tar.gz | grep app.log

Answer

cp /backup/logs.tar.gz:/var/log/app.log /var/log/app.log

Question 8

A technician needs to display the contents of a compressed file named archive.tar.gz without extracting it. Which command should be used?

Accepted Answer

zcat archive.tar.gz | tar -t. Option C is correct because it uses `zcat` to decompress the `.gz` layer on the fly and pipes the resulting uncompressed tar archive into `tar -t`, which lists the contents without extracting. This allows viewing the file listing without first decompressing to disk, satisfying the requirement to display contents without extraction.

Answer

tar -tf archive.tar

Answer

tar -xzf archive.tar.gz

Answer

zcat archive.tar.gz

Question 9

Which TWO commands can be used to create a new empty file?

Accepted Answer

touch file. Option A is correct because the `touch` command is specifically designed to create an empty file if it does not already exist, or update its timestamps if it does. Option D is correct because using the shell redirection operator `>` with no command before it (or with a null command) creates an empty file by truncating any existing content or creating a new zero-byte file.

Answer

mkdir file

Answer

cat file

Answer

echo 'text' > file

Question 10

A system administrator needs to find all files in /home that are owned by user 'alice' and have been modified in the last 7 days. The administrator then wants to compress those files into a single archive named alice_recent.tar.gz. Which of the following commands accomplishes this?

Accepted Answer

find /home -user alice -mtime -7 -exec tar -rf alice_recent.tar.gz {} +. Option A is correct because it uses `find` with `-user alice` and `-mtime -7` to locate files owned by alice modified within the last 7 days, then executes `tar -rf` with `{} +` to append those files to an archive. The `-r` flag appends files to an existing archive (or creates one if it doesn't exist), and `{} +` efficiently passes multiple filenames to a single `tar` invocation, avoiding command-line length limits.

Answer

find /home -user alice -mtime -7 -print | cpio -o > alice_recent.tar.gz

Answer

tar -czf alice_recent.tar.gz -T <(find /home -user alice -mtime -7)

Answer

find /home -user alice -mtime -7 | tar -cvf alice_recent.tar.gz

LFCS Practice Test 2 — 10 Questions

Exhibit

LFCS Practice Test 2 — 10 Questions

Exhibit