HW#4

Question 1

What is the purpose of conditional expressions in shell scripts?

A) They prevent scripts from executing if license conditions aren’t met.

B) They display information about the script’s computer environment.

C) They enable the script to take different actions in response to variable data.

D) They enable scripts to learn in a manner reminiscent of Pavlovian conditioning.

E) They cause scripts to run only at specified times of the day.

Answer 1

C

Question 2

Which command would you type if you wanted to display your username from a Linux command line terminal shell?

A) he|p

B) uid

C) whereami

D) whoami

Answer 2

D

Question 3

Which Linux directory usually holds the system
configuration files?

A) /etc

B) /boot

C) /usr

D) /home

Answer 3

A

Question 4

Which file now stores user’s passwords in the Linux OS?

A) /etc/groups

B) /etc/passwd

C) /etc/shadow

D) /etc/user

Answer 4

C

Question 5

Which of the following Linux command-line tools supports both gzip and bzip2 compression?

A) tar

B) zcat

C) archive

D) zip

Answer 5

A

Question 6

____ files are those that control how the computer operates.

A) System

B) Boot

C) Shutdown

D) Archive

Answer 6

A

Question 7

What are two forms of regular expressions used in Linux?

A) Basic

B) Extended

C) Hexadecimal

D) Alphanumeric

Answer 7

A and B

Question 8

To have a script send an email automatically, which command would you use to do this?

A) mail

B) sed

C) awk

D) email

Answer 8

A

Question 9

_____ are collections of programming functions that can be useful to many programs.

A) Libraries

B) Tarballs

C) Files

D) Subdirectories

Answer 9

A

Question 10

You work as a Network Administrator for a company, and they have a Linux based network. You have created a script named if.cgi. You want to provide the following permissions on it:

rwsr-sr–

A) chmod 6754

B) chmod 2754

C) chmod 4754

D) chmod 7754

Answer 10

A

Question 11

Which wildcard character can be matched for any one symbol in a filename?

A) ?

B) *

C) /

D) +

Answer 11

A

Question 12

Which of the following would you use yum command to install or upgrade applications?

A) Red hat

B) Fedora

C) Unbutu

D) CentOS

Answer 12

A, B, and D

Question 13

True or false: Many (not all) configuration files use a hash mark (#) to identify comment lines?

A) True

B) False

Answer 13

A

Question 14

Which two keyboard characters can denote an account with no password?

A) @

B) *

C)&raquo_space;

D) !

Answer 14

B and D

Question 15

Which of the following redirection operators appends a program’s standard output to an existing file, without overwriting that file’s original contents?

A)&raquo_space;

B) |

C) 2>

D) &>

E) >

Answer 15

A

Question 16

Which of the following directories is where you would find the new mount point for removable media in the Linux OS?

A) /media

B) /mount

C) /run

D) /root

Answer 16

A

Question 17

What is the filename extension for the bzip2 compression program?

A) .bz2

B) .bz

C) .2bz

D) .zb2

Answer 17

A

Question 18

Which of the following type of user information might you find in the /etc/passwd file? (Choose three)

A) The UID

B) A detailed list of every group the user belongs

C) The users account home directory

D) The path to the users GUI desktop environment

E) The path to the users’ default text-mode shell

Answer 18

A, C, and E

Question 19

True or false: To compress files archived with the zip command, you must use an external compression program such as gzip or bzip2 in a pipeline with zip.

A) True

B) False

Answer 19

B

Question 20

True or false: The regular expression Linu[&c.circ;x].*lds matches the string. Linux Torvalds.

A) True

B) False

Answer 20

A

Question 21

A ____is when the standard output from one program is redirected as the standard input to a second program.

A) Pipe

B) Stem

C) Tunnel

D) Tube

Answer 21

A

Question 22

Which optional parameter would you use with the Linux sort command to ignore case sensitivity?

A) -f

B) -o

C) -i

D) -d

Answer 22

A

Question 23

If you are in the Vi text editor command mode, which keystroke would you type to undo a change?

A) b

B) u

C) d

D) a

Answer 23

B

Question 24

If you wanted to run/execute a script called my-script. what could you type in the Linux terminal shell to accomplish this?

A) grep a+x ./myscript

B) apt-get a+x ./myscript

C) chmod a+x ./my-script

D) su a+x myscript

Answer 24

C

Question 25

Which of the following are the two major Linux package management systems? A) RPM B) BASH C) DPKG D) TAR

Answer 25

A and C

Question 26

Which of the following syntaxes will you use to extract a file using the tar command? A) tar-zvf {.tgz-file} B) tar-zxvf {.tgz-file} C) tar-cvff {.tgz-file} D) tar-zwvf {.tgz-file}

Answer 26

B

Question 27

Which of the following files would you search in order to obtain information about a user in a Linux OS? A) /etc/passwd B) /etc/shadow C) /etc/users D) /etc/linux/users

Answer 27

A

Question 28

True or false: You can easily damage your Linux installation by mistyping an rm command when you log into your regular account. A)True B) False

Answer 28

B

Question 29

Which of the following actions is performed when a file is uncompressed? A) Extract B) Execute C) Remove D) Archive

Answer 29

A

Question 30

Which Linux command line tool would give you the following output? mycc@mycc-ubuntu:-$ cd Documents mycc(dmycc -ubuntu : ~/Document* $ ____ text .file 1 2 12 text.file mycc@mycc-ubuntu:-/Documents$ [] A) wc B) apt-get C) nw D) greP

Answer 30

A

Question 31

``` What is the effect of the following short script, cp1, if it’s called as cp1 big.c.big.cc? #!/bin/bash cp $2 $1 ``` A) It has the same effect as the cp command"copying the contents of big.c to big.cc. B) It compiles the C program big.c and calls the result big.cc. C) It copies the contents of big.cc to big.c, eliminating the old big.c. D) It converts the C program big.c into a C++ program called big.cc. E) The script’s first line is invalid, so it won't work.

Answer 31

C

Question 32

Which of the following statements would you need to include in a case statement to denote the end of the case statement? A) eol B) esac C) end D) ease

Answer 32

B

Question 33

You want to run the following command inside your Linux terminal: iptables -L but know you will need to have root access to do so. If you are logged in under a basic user account, which command could you add to give you root access for just this command? A) su iptables -L B) root iptables-L C) sudo iptables-L D) admin iptables-L

Answer 33

C

Question 34

Which keystrokes invoke the pico or nano search function? (Choose two) A) F3 B) F6 C) Esc-S D) Ctrl + F E) Ctrl + W

Answer 34

B and E

Question 35

If you were to type the following in a Linux command line terminal, what type of results might you receive? cat /etc/passwd A) An encrypted list of all user's passwords for that Linux computer. B) An un-encrypted list of all user passwords for that Linux computer. C) A list of all user ID numbers for that Linux computer. D) A list of the users on that Linux computer.

Answer 35

D

Question 36

Which Linux command-line tool would give you this list in alphabetic order? ``` mycc®mycc-ubuntu:~/Documents$ cat animals.txt rabbit monkey dog cat bird snake giraffe mycc®mycc-ubuntu:~/Documents$ ____ animals.txt bird cat dog giraffe monkey snake mycc®mycc-ubuntu:~/Documents$ ``` A) sort B) cut C) ftnd D) wc

Answer 36

A

Question 37

True or false: A user types myscript laser.txt to run a script called myscript. Within myscript. the SO variable holds the value laser.txt. A) True B) False

Answer 37

B

Question 38

``` True or false: The following script launches three simultaneous instances of the terminal program. #!/bin/bash terminal terminal terminal ``` A) True B) False

Answer 38

B

Question 39

How would you remove two lines of text from a file using the Vi text editor? A) In command mode, position the cursor on the first line and type 2dd. B) In command mode, position the cursor on the last line and type 2yy. C) In insert mode, position the cursor at the start of the first line, hold down the Shift key while pressing the Down arrow key twice, and press the Delete key on the keyboard. D) In insert mode, position the cursor at the start of the first line and press Ctrl+K twice. E) Select the text with the mouse and then select File » Delete from the menu.

Answer 39

A

Question 40

What could you type in a Linux command line terminal shell to see a list of all process IDs (PID) on your computer? A) process B) ps C) get paid D) get rid

Answer 40

B

Question 41

Which single keyboard character represents any single character except in a new line in a regular expression in Linux? A) . B) ! C) $ D) #

Answer 41

A

Question 42

Which of the following Linux command-line tool is used to extract a compressed file? A) gunzip B) gzip C) bzip2 D) ext

Answer 42

A

Question 43

What are the two types of outputs that can result in using basic redirection operators in Linux? A) Standard output B) Standard error C) uniform output D) uniform error

Answer 43

A and B

Question 44

Once a shell script has been written, it must be made ____ in order to run it. A) hierarchal B) executable C) backwards compatiable D) flexible

Answer 44

B

Question 45

To uninstall an application using the apt-get command, you would type apt-get _____. A) delete B) wipe C) remove D) release

Answer 45

C

Question 46

Complete the following command to redirect both standard output and standard error from the bigprog program to the file out.txt: $ bigprog____out.txt A) &> B) | C) ~ D) >>

Answer 46

A

Question 47

True or false: The find command enables you to locate files based on their sizes. A) True B) False

Answer 47

A

Question 48

Which of the following command-line tools would be the best to use when compressing more than two files inside a Linux system? A) tar B) gunzip C) gzip D) bzip2

Answer 48

A

Question 49

True or False? You've typed rmdir junk to delete the junk directory, but this command has failed because junk contains word processing files. To do the job. you type rm -r junk. A) True B) False

Answer 49

A

Question 50

You've written a simple shell script that does nothing but launch programs. In order to ensure that the script works with most user shells, what should its first line read? A) ?!/bin/sh B) #!/bin/ls C) #!/bin/sh D) #!/bin/sh/root

Answer 50

C

Question 51

Which character represents the start of a line in a regular expression? A) ^ B) | C) % D) &

Answer 51

A

Question 52

True or false: Many (not all) configuration files use a hash mark (#) to identify comment lines? A) True B) False

Answer 52

A

Question 53

You want to copy a directory, MyFiles, to a USB flash drive that uses the FAT filesystem. The contents of MyFiles are as follows: $ Is -I MyFiles/ total 276 -rw-r-r-- 1 jen users 129840 Nov 8 15:13 contract.odt -rw-r-r-- 1 rod users 42667 Nov 8 15:12 outline.pdf -rw-r-r-- 1 sam users 105979 Nov 8 15:12 Outline.PDF The USB flash drive is mounted at /media/usb. and so you type cp -a MyFiles//media/usb. What problem will occur when you attempt to copy these files? A) One file will be missing on the USB flash drive. B) Everything will be fine; the command will work correctly. C) One file's name will be changed during the copy. D) The command will fail because it tries to create links. E) The MyFiles directory will be copied, but none of its files will be copied.

Answer 53

A

Question 54

If you were in a Linux command line terminal and saw a system account with the UID of 0, what would that indicate? A) It's the first user account created by the OS. B) It's the system administrator (root) account. C) It's an account with no privileges. D) It's a guest account.

Answer 54

B

Question 55

Using the image below, what does the x character represent? roman x l025:100::/home/roman:/bin/bash A) An un-encrypted password stored in the/etc/shadow file. B) An encrypted password stored in the /etc/passwd file. C) An encrypted password stored in the /etc/shadow file. D) An account with no password set.

Answer 55

C

Question 56

True or false: You can set a directory's timestamps with the touch command. A) True B) False

Answer 56

A

Question 57

True or false: Valid looping statements in Bash include for. while, and until. A) True B) False

Answer 57

A

Question 58

Which command would you use to display prompts for a user in a shell script? A) touch B) copy C) /bin/bash D) echo

Answer 58

D

Question 59

True or false: Unicode is useful for encoding most European languages but not Asian languages. A) True B) False

Answer 59

B

Question 60

True or false: GUI text editors for ASCII are superior to text-mode ASCII text editors because the GUI editors support underlining, italics, and multiple fonts. A) True B) False

Answer 60

B

Question 61

If you were doing a regular expression inside a Linux command line, which special character on the keyboard would give you two possible matches using the example below: car____truck A) | B) \ C) / D) []

Answer 61

A

Question 62

ASCII supports___unique characters. A) 32 B) 64 C) 128 D) 256

Answer 62

C

Question 63

If you are a Linux system administrator and wanted to locate any programs that are consuming large amounts of the CPU or memory, what command-line tool would help assist you with this? A) pid B) top C) load D) cpu

Answer 63

B

Question 64

True or false: Linux stores information on groups in the /etc/groups file. A) True B) False

Answer 64

B

Question 65

Which of the following directories stores package database information? A) /var/lib B) /usr/Iib C) /etc/lib D) /tmp/lib

Answer 65

A

Question 66

Which of the following extensions would you use at the end of the script name? A) .st B) .sh C) .sc D) .sr

Answer 66

B

Question 67

True or false: You can create a symbolic link from one low-level filesystem to another. A) True B) False

Answer 67

A

Question 68

Which compression file format can be used across multiple operating systems (Linux, Windows. Mac OS) A) zip file B) tar file C) xzfile D) pdf file

Answer 68

A

Question 69

You type mkdir one/two/three and receive an error message that reads, in part, No such file or directory. What can you do to overcome this problem? A) Issue three separate mkdir commands: mkdir one. then mkdir one/two. and then mkdir one/two/three. B) Type rmdir one to clear away the interfering base of the desired new directory tree. C) Type rm -r one to clear away the entire interfering directory tree. D) Type touch /bin/mkdir to be sure the mkdir program file exists.

Answer 69

A

Question 70

Which of the following are considered RPM-based Linux distributions? (choose all that apply) A) Red Hat B) Fedora C) Ubuntu D) Linux Mint E) CentOS F) SUSE Enterprise

Answer 70

A, B, E, and F

Question 71

If you were a Linux system administrator and wanted to see who is currently logged into the computer and what programs they are currently running, you can type the command. A) w B) whoami C) uid D) u

Answer 71

A

Question 72

Which single keyboard character represents any single character except in a new line in a regular expression in Linux? A) . B) ! C) $ D) #

Answer 72

A

Question 73

Which of the following entries would you use on the first line of a script you are creating in Linux? A) #! B) #!/bin/sh C) !#/bin/bash D) !#/bin/sh

Answer 73

B

Question 74

Which of the following keyboard strokes would you use to connect two or more commands in Linux? A) > B) >> C) | D) +

Answer 74

C

Question 75

If a Linux system has no programs demanding CPU time what number would best represent the load average on that computer? A) 0 B) 1 C) 10 D) 100

Answer 75

A

Question 76

Which type of file is nano LEAST likely to be useful for examining or editing? A) A /var/log/messages log file B) An HTML Web page file C) An e-mail message saved from an e-mail client D) A LibreOffice word processing document E) An /etc/Xll/xorg.conf configuration file

Answer 76

D

Question 77

After using a text editor to create a shell script, what step should you take before trying to use the script by typing its name? A) Set one or more executable bits using chmod. B) Copy the script to the /usr/bin/scripts directory. C) Compile the script by typing bash scriptname, where scriptname is the script's name. D) Run a virus checker on the script to be sure it contains no viruses. E) Run a spelI checker on the script to ensure it contains no bugs.

Answer 77

A

Question 78

Which of the following is NOT considered a Debian based Linux distribution? A) Debian B) Ubuntu C) Linux Mint D) OpenSUSE

Answer 78

D

Question 79

Which optional parameter would you use with the Linux tar command to extract files from an archive? A) -x B) -d C) -A D) -c

Answer 79

A

Question 80

Which of the following Linux commands will print lines from the file world.txt that contain matches to changes and changed? A) grep change[ds] world.txt B) tar change[d-s] world.txt C) find "change'd|s"' world.txt D) cat world.txt changes changed E) find change[&c.circ;ds] world.txt

Answer 80

A

Question 81

Which file hierarchy structure was created to give a standardization to the Linux filesystem structure? A) FHS B) SMB C) SMS D) NTFS

Answer 81

A

Question 82

Which of the following actions does the find command perform? A) Searching a file in a directory B) Changing text in a file C) Listing all hidden files and directories D) Matching a pattern in a file

Answer 82

A

Question 83

What are the two types of FHS files found in the Filesystem Hierarchy Standard? A) Standard B) Variable C) Synchronous D) Asynchronous

Answer 83

A and B