Deck 5: Creating Shell Scripts and Displaying File Contents

Question 1

The functions of the three permission types (read, write, and execute) are applied the same for files and directories.

Answer 1

False

Question 2

By default, only root can execute a file automatically.

Answer 2

False

Question 3

Successful commands usually return the code 0 to the shell.

Answer 3

True

Question 4

You can use condition statements to create menu scripts that allow users to choose from a list of options.

Question 5

The if statement can only return a binary zero or one condition.

Question 6

Which symbol represents a permission that has not been granted?

A) Asterisk (*)
B) Carrot (^)
C) Hyphen (-)
D) Forward slash (/)

Question 7

Which command removes write and execute permissions for the other category on file4?

A) chmod o-wx file4
B) chmod file4 o-wx
C) rem file4 o-wx
D) del o-wx file4

Question 8

What is the corresponding numeric notation for a file with rw-rw-r-- permissions?

A) 221
B) 664
C) 110
D) 441

Question 9

____ consists of binary ones and zeros.

A) Script code
B) Variable code
C) Pseudocode
D) Machine code

Question 10

The BASH shell is an example of a(n)____.

A) interpreter
B) compiler
C) kernel file
D) machine code file

Question 11

With a compiled program, all the source code is converted to machine code and stored in a ____ before the user runs the script.

A) temporary file
B) buffer
C) binary file
D) variable

Question 12

Which command is used to display a list of all environment variables and their stored values?

A) dev
B) $echo
C) env
D) dvar

Question 13

Which variable assignment method would you use to specify a variable's value in a script command?

A) Conditional
B) Direct assignment
C) Prompt
D) Positional parameter

Question 14

Which variable assignment method is useful when you need information from the user to complete the script?

A) Conditional
B) Direct assignment
C) Prompt
D) Positional parameter

Question 15

When you run the scr1 script using the ./scr1 command, the filename is considered position zero in the command, and the text ./scr1 becomes the value of the ____ variable.

A) $0
B) $1
C) $run
D) $command

Question 16

Which command will display the exit status code on the screen?

A) env scode
B) echo $?
C) dis code
D) sh

Question 17

Which command ends a case statement?

A) ;;end
B) !!end
C) stop
D) esac

Question 18

The case statement syntax requires a(n) ____ to mark the end of each code portion matching a specific value.

A) period (.)
B) exclamation mark(!)
C) double semicolon (;;)
D) double exclamation mark(!!)

Question 19

The cat command is usually used to display the contents of a ____.

A) large text file
B) log file
C) small text file
D) memory dump

Question 20

The head command displays the first ____ lines of a text file.

A) two
B) five
C) ten
D) 100

Question 21

What is the result of running the head -15 scr8 command?

A) The command displays the last 15 lines of the scr8 file.
B) The command displays the first 15 lines of the scr8 file.
C) The command displays the contents of the scr8 file without the last 15 lines.
D) The command displays the contents of the scr8 file starting at line 15.

Question 22

What is the result of running the tail +5 scr8 command?

A) The command displays the last five lines of the scr8 file.
B) The command displays every fifth line of the scr8 file.
C) The command displays the contents of the scr8 file in reverse, five times.
D) The command displays the contents of the scr8 file starting at line five.

Question 23

Which command displays a file's contents one screen at a time?

A) head
B) show
C) echo
D) more

Question 24

Which command works the same as the more command but offers more flexibility in navigation?

A) less
B) dis
C) down
D) show

Question 25

A(n) ____________________ is a set of rules for instructing a computer how to perform specific tasks.

Question 26

With a(n) ____________________ program, the source code is converted to machine code, line by line, as the user runs the script.

Question 27

The purpose of a(n) ____________________ is to add documentation information for users and anyone else who might need to modify the script.

Question 28

When you quit a program or a command, a numeric code called a(n) ____________________ is sent to the shell.

Question 29

____________________ is used to perform a set of commands repeatedly.

Question 30

Match each statement with an item

-Indicates the end of the condition being tested.

A) if statement
B) then statement
C) else statement
D) fi statement
E) while statement
F) until statement
G) for statement
H) do statement
I) done statement

Question 31

Match each statement with an item

-Indicates the end of the code to be repeated.

A) if statement
B) then statement
C) else statement
D) fi statement
E) while statement
F) until statement
G) for statement
H) do statement
I) done statement

Question 32

Match each statement with an item

-A loop statement that specifies the number of times to execute the portion of code.

A) if statement
B) then statement
C) else statement
D) fi statement
E) while statement
F) until statement
G) for statement
H) do statement
I) done statement

Question 33

Match each statement with an item

-A loop statement that causes the interpreter to continue executing the code in the until loop portion of the script as long as the condition is false.

A) if statement
B) then statement
C) else statement
D) fi statement
E) while statement
F) until statement
G) for statement
H) do statement
I) done statement

Question 34

Match each statement with an item

-Starts the condition being tested.

A) if statement
B) then statement
C) else statement
D) fi statement
E) while statement
F) until statement
G) for statement
H) do statement
I) done statement

Question 35

Match each statement with an item

-A loop statement that tests a condition in much the same way as if-then statements.

A) if statement
B) then statement
C) else statement
D) fi statement
E) while statement
F) until statement
G) for statement
H) do statement
I) done statement

Question 36

Match each statement with an item

-Starts the portion of code specifying what to do if the condition evaluates to false.

A) if statement
B) then statement
C) else statement
D) fi statement
E) while statement
F) until statement
G) for statement
H) do statement
I) done statement

Question 37

Match each statement with an item

-Indicates the beginning of the code to be repeated.

A) if statement
B) then statement
C) else statement
D) fi statement
E) while statement
F) until statement
G) for statement
H) do statement
I) done statement

Question 38

Match each statement with an item

-Starts the portion of code specifying what to do if the condition evaluates to true.

A) if statement
B) then statement
C) else statement
D) fi statement
E) while statement
F) until statement
G) for statement
H) do statement
I) done statement

Question 39

Identify and define the three categories of file permissions.

Question 40

Why should you give only read and write permission to a file that is not a program?

Question 41

Why is it essential to understand the basics of shell scripting?

Question 42

After creating a shell script and assigning execute permissions, how do you define its stored location and why must you do this?

Question 43

Describe a shell variable.

Question 44

How do you combine the else and if statements? Why is this advantageous?

Question 45

Describe the case statement.

Question 46

Describe an until loop.

Question 47

Describe a for loop.

Question 48

Which command can be used to display a text file's contents in reverse order and why might a user want to do this?