Deck 6: Introduction to Shell Script Programming

Question 1

The ____ command prints a listing of environment and configuration variables.

A)printenv
B)printvar
C)printf
D)bash

Answer 1

A

Question 2

To reference a variable,you use a dollar sign ($)in front of it or enclose it in ____.

A)square brackets ([ ])
B)curly brackets ({ })
C)double quotes (" ")
D)angle brackets (< >)

Answer 2

B

Question 3

In shell scripts,comment lines begin with a(n)____.

A)tilde (~)character
B)dollar ($)sign
C)pound (#)symbol
D)exclamation (!)sign

Answer 3

C

Question 4

The ____ shell,when compared to the other shells,has a more powerful programming interface.

A)Bourne
B)Bash
C)C
D)Korn

Question 5

A program's high-level language statements are stored in a file called the ____ file.

A)shell
B)script
C)program
D)source

Question 6

Shell scripts run more quickly than compiled programs.

Question 7

Shell scripts can automatically access variables created and assigned on the command line.

Question 8

If a source file contains ____ errors,it cannot be converted into an executable file.

A)syntax
B)debugging
C)compilation
D)logic

Question 9

The Bash shell offers improved features over the older Bourne and Korn shells and is fully backward compatible with the Bourne shell.

Question 10

You use the chexec command to indicate that a (shell script)file can be executed.

Question 11

You should omit spaces when you assign a variable without using single or double quotation marks around its value.

Question 12

A ____ is a name consisting of letters,numbers,or characters and is used to reference the contents of a variable.

A)comment
B)symbolic name
C)label
D)tag

Question 13

When you assign a value to a variable,you might want to evaluate it by displaying its contents via a(n)____ operator.

A)definition
B)echo
C)evaluating
D)print

Question 14

The UNIX-Linux shell acts as a(n)____ when reading script files.

A)compiler
B)interpreter
C)assembler
D)linker

Question 15

____ variables are used to store information about the setup of the operating system,and after they are set up,you typically do not change them.

A)Global
B)Environment
C)Configuration
D)Shell

Question 16

Logic structures are also called ____ structures.

A)decision
B)sequential
C)control
D)programming

Question 17

____ gives the owner read,write,and execute permissions.

A)chmod 155
B)chmod 551
C)chmod 577
D)chmod 755

Question 18

____ variables are those you create at the command line or in a shell script.

A)Global
B)Environment
C)Configuration
D)Shell

Question 19

A high-level language is a computer language that uses English-like expressions.

Question 20

The ____ reads the lines of code that the programmer wrote in the source file and converts them to the appropriate machine-language instructions.

A)compiler
B)linker
C)assembler
D)interpreter

Question 21

The ____ statement simplifies the selection of a match when you have a list of choices.

A)if
B)switch
C)case
D)while

Question 22

Match each item with a statement below.
a.!
f.SHELL
b.?
g.PATH
c.ENV
h.~
d.PS1
i.BASH
e.HOME
environment variable that holds the primary shell prompt

Question 23

Shell scripts support many shell script ____________________,including those for assigning the contents of a shell variable,for evaluating information,for performing mathematical operations,and for piping or redirection of input-output.

Question 24

The ____________________ shell is similar to the Bash shell in many respects,but has syntax similar to that of C programming.

Question 25

You use the ____________________ command to loop through a range of values.

Question 26

Match each item with a statement below.
a.!
f.SHELL
b.?
g.PATH
c.ENV
h.~
d.PS1
i.BASH
e.HOME
environment variable that contains the file name containing commands to initialize the shell

Question 27

The ____ statement continues to loop and execute commands or statements as long as a given condition or set of conditions is true.

A)for
B)while
C)esac
D)case

Question 28

The ____ command is useful when you want your shell program to automatically remove any temporary files that are created when the shell script runs.

A)set
B)export
C)tput
D)trap

Question 29

The ____________________ command,used to run a shell script,includes several options for debugging.

Question 30

Match each item with a statement below.
a.!
f.SHELL
b.?
g.PATH
c.ENV
h.~
d.PS1
i.BASH
e.HOME
environment variable that contains the absolute path to the Bash shell,such as -bin-bash

Question 31

Logic structures supported by shell scripts include: sequential logic,decision logic,looping logic,and ____________________ logic.

Question 32

Match each item with a statement below.
a.!
f.SHELL
b.?
g.PATH
c.ENV
h.~
d.PS1
i.BASH
e.HOME
environment variable that identifies the path name for user's home directory

Question 33

____ operators compare the relationship between two values or arguments.

A)Evaluation
B)Comparison
C)Logical
D)Relational

Question 34

With no options,____ displays the current listing of Bash environment and shell script variables.

A)let
B)set
C)sh
D)export

Question 35

Wildcard characters are also known as ____ characters.

A)bogus
B)filler
C)glob
D)search

Question 36

The ____ command enables you to initialize the terminal display or terminal window,to place text and prompts in desired locations,and to respond to what the user selects from the menu.

A)put
B)tput
C)clear
D)tclear

Question 37

Match each item with a statement below.
a.!
f.SHELL
b.?
g.PATH
c.ENV
h.~
d.PS1
i.BASH
e.HOME
environment variable that holds the path name of the program for the type of shell you are using

Question 38

____________________ are text files that contain sequences of UNIX-Linux commands.

Question 39

____________________ operators are used to assign a value to a variable.

Question 40

The ____________________ variable provides a list of directory locations where UNIX or Linux looks to find executable scripts or programs.

Question 41

What is an algorithm?

Question 42

What is a string variable?

Question 43

Match each item with a statement below.
a.!
f.SHELL
b.?
g.PATH
c.ENV
h.~
d.PS1
i.BASH
e.HOME
bitwise negation operator

Question 44

What are shell variables?

Question 45

What is a glob pattern?

Question 46

What is looping logic?

Question 47

What is a branch instruction?

Question 48

Match each item with a statement below.
a.!
f.SHELL
b.?
g.PATH
c.ENV
h.~
d.PS1
i.BASH
e.HOME
matches exactly one character,except for the backslash and period

Question 49

What is debugging?

Question 50

What is the back quote operator (`)used for?

Question 51

What is the program development cycle?

Question 52

What is an operand?

Question 53

What is a prototype?

Question 54

Match each item with a statement below.
a.!
f.SHELL
b.?
g.PATH
c.ENV
h.~
d.PS1
i.BASH
e.HOME
logical negation operator

Question 55

Match each item with a statement below.
a.!
f.SHELL
b.?
g.PATH
c.ENV
h.~
d.PS1
i.BASH
e.HOME
environment variable that holds the list of path names for directories searched for executable commands