Get 2023 Updated Free Linux Foundation LFCS Exam Questions & Answer [Q27-Q49] : Exams Labs Braindumps : http://blog.examslabs.com

QUESTION 27
SUMULATION
Which file in the /proc filesystem lists parameters passed from the bootloader to the kernel? (Specify the file name only without any path.)

QUESTION 28
What is the maximum niceness value that a regular user can assign to a process with the nice command when executinga new process?

QUESTION 29
CORRECT TEXT
The presence of what file will temporarily prevent all users except root from logging into the system? (Specify the full name of the file, including path.)

QUESTION 30
What output will the following command sequence produce?
echo ‘1 2 3 4 5 6’ | while read a b c; do
echo result: $c $b $a;
done

result: 3 4 5 6 2 1

result: 1 2 3 4 5 6

result: 6 5 4

result: 6 5 4 3 2 1

result: 3 2 1

QUESTION 31
SIMULATION
Which file contains a set of services and hosts that will be allowed to connect to the server by going through a TCP Wrapper program such as tcpd? (Specify the full name of the file, including path.)

QUESTION 32
Which character starts a comment line in a shell script file?

;

QUESTION 33
When running the command
sed -e “s/a/b/” /tmp/file >/tmp/file
While /tmp/file contains data, why is /tmp/file empty afterwards?

The file order is incorrect. The destination file must be mentioned before the command to ensure redirection.

The command sed did not match anything in that file therefore the output is empty.

When the shell establishes the redirection it overwrites the target file before the redirected command starts and opens it for reading.

Redirection for shell commands do not work using the > character. It only works using the | character instead.

QUESTION 34
Which command chain will count the number of regular files with the name of foo.txt within /home?

ls -lR /home | grep foo.txt | wc -l

find /home -type f -name foo.txt | wc -l

find /home -name foo.txt -count

find /home -name foo.txt | wc -l

grep -R foo.txt /home | wc -l

QUESTION 35
Which of the following commands prints a list of usernames (first column) and their primary group (fourth column) from the /etc/passwd file?

fmt -f 1,4 /etc/passwd

split -c 1,4 /etc/passwd

cut -d : -f 1,4 /etc/passwd

paste -f 1,4 /etc/passwd

QUESTION 36
What is a purpose of an SSH host key?

It must be sent by any SSH client in addition to a user key in order to identify the client’s host.

It provides the server’s identity information to connecting SSH clients.

It is the root key by which all user SSH keys must be signed.

It authenticates any user that logs into a remote machine from the key’s host.

It is used by system services like cron, syslog or a backup job to automatically connect to remote hosts.

QUESTION 37
In Bash, inserting 1>&2 after a command redirects

standard error to standard input.

standard input to standard error.

standard output to standard error.

standard error to standardoutput.

standard output to standard input.

QUESTION 38
CORRECT TEXT
Which file in the /proc filesystem lists parameters passed from the bootloader to the kernel? (Specify the file name only without any path.)

QUESTION 39
Which of the following SQL queries counts the number of occurrences for each value of the field order_type in the table orders?

SELECT order_type,COUNT(*) FROM orders WHERE order_type=order_type;

SELECT order_type,COUNT(*) FROM orders GROUP BY order_type;

COUNT(SELECT order_type FROM orders);

SELECT COUNT(*) FROM orders ORDER BY order_type;

SELECT AUTO_COUNT FROM orders COUNT order_type;

QUESTION 40
When the command echo $ outputs 1, which of the following statements is true?

It is the process ID of the echo command.

It is the process ID of the current shell.

It is the exit value of the command executed immediately before echo.

It is the exit value of the echo command.

QUESTION 41
Which of the following commands determines the type of a file by using a definition database file which contains information about all common file types?

magic

type

file

pmagic

hash

QUESTION 42
Which of the following commands redirects the output of cmd to the file foo.txt, in which an existing file is overwritten?

cmd || foo.txt

cmd | foo.txt

cmd && foo.txt

cmd >> foo.txt

cmd > foo.txt

QUESTION 43
Which of the following commands can be used to display the local routing table? (Choose TWO correct answers.)

ifconfig

dig

netstat

route

trackroute

QUESTION 44
What is the command to delete the default gateway from the system IP routing table? (Choose TWO correct answers.)

route del default

ifconfig unset default

netstat -r default

ip route del default

sysctl ipv4.default_gw=0

QUESTION 45
What is the correct command to extract the contents of the archive file download.bz2?

unpack download.bz2

unzip2 download.bz2

bunzip2 download.bz2

unzip download.bz2

uncompress download.bz2

QUESTION 46
Which of the following commands will NOT update the modify timestamp on the file /tmp/myfile.txt?

file /tmp/myfile.txt

echo “Hello” >/tmp/myfile.txt

sed -ie “s/1/2/” /tmp/myfile.txt

echo -n “Hello” >>/tmp/myfile.txt

touch /tmp/myfile.txt

QUESTION 47
SIMULATION
Which command is used to set the hostname of the local system? (Specify ONLY the command without any path or parameters.)

QUESTION 48
CORRECT TEXT
What two character sequence is present at the beginning of an interpreted script? (Please specify the TWO correct characters only)

QUESTION 49
CORRECT TEXT
Which command displays a list of allbackground tasks running in the current shell? (Specify ONLY the command without any path or parameters.)

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