Question 1

Given a file called birthdays containing lines like:   YYYY-MM-DD Name   1983-06-02 Tim   1995-12-17 Sue Which command would you use to output the lines belonging to all people listed whose birthday is in May or June?
A) grep '[56]' birthdays
B) grep 05?6? birthdays
C) grep '[0-9]*-0[56]-' birthdays
D) grep 06 birthdays | grep 05

Accepted Answer

The pattern '[0-9]*-0[56]-' matches any line where the month is either 05 (May) or 06 (June) by looking for the format YYYY-05- or YYYY-06-.

Question 2

Which of the following find commands will print out a list of files owned by root and with the SUID bit set in /usr?
A) find /usr -uid 0 -perm +4000
B) find -user root +mode +s /usr
C) find -type suid -username root -d /usr
D) find /usr -ls \*s\* -u root
E) find /usr -suid -perm +4000

Accepted Answer

The command "find /usr -uid 0 -perm +4000" correctly searches for files in /usr that are owned by root (UID 0) and have the SUID bit set (permission +4000).

Question 3

Which of the following programs uses the hosts.allow file to perform its main task of checking for access control restrictions to system services?
A) tcpd
B) inetd
C) fingerd
D) mountd
E) xinetd

Accepted Answer

The tcpd program, also known as TCP Wrapper, uses the hosts.allow file to determine access control restrictions for system services.

Question 4

Which approach will provide a listing of the contents in a tar archive?
A) Use the tar command with -t.
B) Use the grep command.
C) Use the find command.
D) Use the zless command.
E) Use the zlist command.

Accepted Answer

The tar command with the -t option is used to list the contents of a tar archive without extracting them.

Question 5

What is the correct command to extract the contents of the archive file download.bz2?
A) unpack download.bz2
B) unzip2 download.bz2
C) bunzip2 download.bz2
D) unzip download.bz2
E) uncompress download.bz2

Accepted Answer

The correct command to extract a .bz2 file is "bunzip2".

Question 6

What is a purpose of an SSH host key?
A) It must be sent by any SSH client in addition to a user key in order to identify the client's host.
B) It provides the server's identity information to connecting SSH clients.
C) It is the root key by which all user SSH keys must be signed.
D) It authenticates any user that logs into a remote machine from the key's host.
E) It is used by system services like cron, syslog or a backup job to automatically connect to remote hosts.

Accepted Answer

SSH host keys are used to verify the identity of the server to the client, ensuring that the client is connecting to the correct server.

Question 7

Which of the following commands preloads and manages keys that are used for automatic authentication while logging in to other machines using SSH?
A) sshd
B) ssh-agent
C) ssh-keygen
D) ssh-add

Accepted Answer

ssh-agent is the command that preloads and manages keys for automatic authentication in SSH sessions.

Question 8

Which of the following commands will output all of the lines with the name Fred in upper or lower case but not the word red from the file data_file? (Choose two)
A) grep -v fred data_file
B) grep '[f]red' data_file
C) egrep fred data_file
D) grep '[Ff]red' data_file
E) grep -i fred data_file

Accepted Answer

grep '[Ff]red' data_file matches lines with the word "fred" in upper or lower case.grep -i fred data_file matches lines with the word "fred" in upper or lower case, but not the word "red".

Question 9

The script, script.sh, consists of the following lines:   #!/bin/bash   echo $2 $1 Which output will appear if the command, ./script.sh test1 test2, is entered?
A) test1 test2
B) test2 test1
C) script.sh test2
D) script.sh test1
E) test1 script.sh

Accepted Answer

The script echoes the second argument ($2) followed by the first argument ($1), so the output will be "test2 test1".

Question 10

Which of the following commands redirects the output of cmd to the file foo.txt, in which an existing file is overwritten?
A) cmd || foo.txt
B) cmd | foo.txt
C) cmd && foo.txt
D) cmd >> foo.txt
E) cmd > foo.txt

Accepted Answer

The command `cmd > foo.txt` redirects the output of `cmd` to `foo.txt`, overwriting the existing file.

Question 11

Which character starts a comment line in a shell script file?
A) ;
B) *
C) #
D) /

Accepted Answer

In shell scripts, the "#" character is used to start a comment line.

Question 12

Which command chain will count the number of regular files with the name of foo.txt within /home?
A) ls -lR /home | grep foo.txt | wc -l
B) find /home -type f -name foo.txt | wc -l
C) find /home -name foo.txt -count
D) find /home -name foo.txt | wc -l
E) grep -R foo.txt /home | wc -l

Accepted Answer

The command "find /home -type f -name foo.txt | wc -l" searches for regular files named foo.txt and counts them.

Question 13

Which of the following keywords can be used in the file /etc/resolv.conf? (Choose TWO correct choices.)
A) substitute
B) nameserver
C) search
D) lookup
E) method

Accepted Answer

The nameserver keyword specifies the IP address of a DNS server to use for name resolution. The search keyword specifies a list of search domains to use when resolving hostnames.

Question 14

When trying to unmount a device it is reported as being busy. Which of the following commands could be used to determine which process is causing this?
A) debug
B) lsof
C) nessus
D) strace
E) traceroute

Accepted Answer

lsof is a command that lists open files and the processes that have them open. It can be used to determine which process is causing a device to be busy.

Question 15

Which command is used to set restrictions on the size of a core file that is created for a user when a program crashes?
A) core
B) edquota
C) ulimit
D) quota

Accepted Answer

The `ulimit` command is used to set user-level resource limits, including the size of core files generated when a program crashes.

Question 16

Which of the following programs can be used to determine the routing path to a given destination?
A) dig
B) netstat
C) ping
D) route
E) traceroute

Accepted Answer

Traceroute is used to determine the routing path to a given destination by showing the path data packets take across a network.

Question 17

Which of the following tools used for DNS debugging, reports not only the response from the name server but also details about the query?
A) dnsq
B) dig
C) hostname
D) dnslookup
E) zoneinfo

Accepted Answer

The 'dig' command is a DNS debugging tool that provides detailed information about DNS queries and responses, including the query itself.

Question 18

Which configuration file would be edited to change default options for the OpenSSH server?
A) /etc/ssh/sshd_config
B) /etc/ssh/ssh
C) /etc/ssh/server
D) /etc/ssh/ssh_config
E) /etc/ssh/ssh_server

Accepted Answer

The default configuration file for the OpenSSH server is /etc/ssh/sshd_config. This file contains settings that control the behavior of the SSH daemon (sshd).

Question 19

How can the current directory and its subdirectories be searched for the file named MyFile.xml?
A) find . -name MyFile.xml
B) grep MyFile.xml | find
C) grep -r MyFile.xml .
D) less MyFile.xml
E) search Myfile.xml ./

Accepted Answer

The `find` command is used to search for files in a directory hierarchy. The command `find . -name MyFile.xml` searches for the file named MyFile.xml starting from the current directory (denoted by `.`) and includes all subdirectories.

Question 20

Which of the following command sequences overwrites the file foobar.txt?
A) echo "QUIDQUIDAGIS" >> foobar.txt
B) echo "QUIDQUIDAGIS" < foobar.txt
C) echo "QUIDQUIDAGIS" > foobar.txt
D) echo "QUIDQUIDAGIS" | foobar.txt

Accepted Answer

The command `echo "QUIDQUIDAGIS" > foobar.txt` uses the `>` operator, which redirects the output to overwrite the file `foobar.txt`.

Exam 1: Linux Foundation Certified System Administrator

Given a file called birthdays containing lines like: YYYY-MM-DD Name 1983-06-02 Tim 1995-12-17 Sue Which command would you use to output the lines belonging to all people listed whose birthday is in May or June?

Which of the following find commands will print out a list of files owned by root and with the SUID bit set in /usr?

Which of the following programs uses the hosts.allow file to perform its main task of checking for access control restrictions to system services?

Which approach will provide a listing of the contents in a tar archive?

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

What is a purpose of an SSH host key?

Which of the following commands preloads and manages keys that are used for automatic authentication while logging in to other machines using SSH?

Which of the following commands will output all of the lines with the name Fred in upper or lower case but not the word red from the file data_file? (Choose two)

The script, script.sh, consists of the following lines: #!/bin/bash echo $2 $1 Which output will appear if the command, ./script.sh test1 test2, is entered?

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

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

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

Which of the following keywords can be used in the file /etc/resolv.conf? (Choose TWO correct choices.)

When trying to unmount a device it is reported as being busy. Which of the following commands could be used to determine which process is causing this?

Which command is used to set restrictions on the size of a core file that is created for a user when a program crashes?

Which of the following programs can be used to determine the routing path to a given destination?

Which of the following tools used for DNS debugging, reports not only the response from the name server but also details about the query?

Which configuration file would be edited to change default options for the OpenSSH server?

How can the current directory and its subdirectories be searched for the file named MyFile.xml?

Which of the following command sequences overwrites the file foobar.txt?