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Linux-Foundation LFCS Sample Question Answers
Question # 1
Which of the following commands will send output from the program myapp to both
standard output (stdout) and the file file1.log?
A. cat < myapp | cat > file1.log B. myapp 0>&1 | cat > file1.log C. myapp | cat > file1.log D. myapp | teefile1.log E. tee myapp file1.log
Answer: D
Question # 2
What is the output of the following command?for token in a b c; do
echo -n ${token};
done
A. anbncn B. abc C. $token$token$token D. {a}{b}{c} E. a b c
Answer: B
Question # 3
Which of the following sequences in the vi editor saves the opened document and exits the
editor?(Choose TWO correct answers.)
A. esc ZZ B. ctrl :w! C. esc zz D. esc :wq! E. ctrl XX
Answer: A,D
Question # 4
Whichof the following commands displays the contents of a gzip compressed tar archive?
A. gzip archive.tgz | tar xvf - B. tar ztf archive.tgz C. gzip -d archive.tgz | tar tvf - D. tar cf archive.tgz
Answer: B
Question # 5
Which command, depending on its options, can display the open network connections, the
routing tables, as well as network interface statistics. (Specify ONLY the command without
any path or parameters.)
Answer: netstat, /bin/netstat, ss, /usr/bin/ss
Question # 6
What is the lowest numbered unprivileged TCP port? (Specify the number in digits only.)
Answer: 1024
Question # 7
In which directory must definition files be placed to add additional repositories to yum?
In the vi editor, how can commands such as moving the cursor or copying lines into the
buffer be issued multiple times or applied to multiple rows?
A. By using the command :repeat followed by the number and the command. B. By specifying the number right in front of a command such as 4l or 2yj. C. By selecting all affected lines using the shift and cursor keys before applying the
command. D. By issuing acommand such as :set repetition=4 which repeats every subsequent
command 4 times.
Answer: B
Question # 9
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
A. result: 3 4 5 6 2 1 B. result: 1 2 3 4 5 6 C. result: 6 5 4 D. result: 6 5 4 3 2 1 E. result: 3 2 1
Answer: A
Question # 10
What is the first program that is usually started, at boot time, by the Linux kernel when
using SysV init?
A. /lib/init.so B. /sbin/init C. /etc/rc.d/rcinit D. /proc/sys/kernel/init E. /boot/init
Answer: B
Question # 11
What does the ? symbol within regular expressions represent?
A. Match the preceding qualifier one or more times. B. Match the preceding qualifier zero or more times. C. Matchthe preceding qualifier zero or one times. D. Match a literal ? character.
Answer: C
Question # 12
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
Answer: B
Question # 13
Regarding the command:
nice -5 /usr/bin/prog
Which of the following statements is correct?
A. /usr/bin/prog is executed with a nice level of -5. B. /usr/bin/prog is executed with a nice level of 5. C . /usr/bin/prog is executed with a priority of -5. D. /usr/bin/prog is executed with a priority of 5.
Answer: B
Question # 14
Which of the following commands can be used to download the RPM package kernel without installing it?
A. yum download --no-install kernel B. yumdownloader kernel C. rpm --download --package kernel D. rpmdownload kernel
Answer: B
Question # 15
Which of the following commands will create an archive file, named backup.tar, containing
all the files from the directory /home?
A. tar /home backup.tar B. tar -cf /home backup.tar C. tar -xf /home backup.tar D. tar -xf backup.tar /home E. tar -cf backup.tar /home
Answer: E
Question # 16
Which file used by XDM specifies the default wallpaper?
A. /etc/X11/xdm/Xsetup B. /etc/X11/xdm.conf C. /etc/X11/xdm/Defaults D. /etc/X11/defaults.conf
Answer: A
Question # 17
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
Answer: E
Question # 18
Instead of supplying an explicit device in /etc/fstab for mounting, what other options may be
used to identify the intended partition? (Choose TWO correct answers.)
A. FIND B. ID C. LABEL D. NAME E. UUID
Answer: C,E
Question # 19
Which of the following commands lists the dependencies of a given dpkg package?
A. apt-cache depends-on package B. apt-cache dependencies package C. apt-cache depends package D. apt-cache requires package.
Answer: C
Question # 20
Which option in the /etc/ntp.conf file specifies an external NTP source to be queried for
time information? (Specify ONLY the option without any values or parameters.)
Answer: server
Question # 21
Which of the following options is used in a GRUB Legacy configuration file to define the
amount of time that the GRUB menu will be shown to the user?
A. hidemenu B. splash C. timeout D. showmenu
Answer: C
Question # 22
Which of the following fields can be found in the /etc/group file? (Choose THREE correct
answers.)
A. The list of users that belong to the group. B. The home directory of the group. C. The name of the group. D. The description of the group. E. The password of the group.
Answer: A,C,E
Question # 23
How can the normal output of a command be written to a file while discarding the error
output?
A. command >2>file 1&>/dev/null B. command < output > /dev/null C. command > discard-error > file D. command > /dev/null 2&>1 output E. command >file 2>/dev/null
Answer: E
Question # 24
Which of the following files, located in the user home directory, is used to store the Bash
history?
A. .bash_history B. .bash_histfile C. .history D. .bashrc_history E. .history_bash
Answer: A
Question # 25
Which character, added to the end of a command, runs that command in the background
as a child process of the current shell?
A. ! B. + C. & D. % E. #
Answer: C
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