Deck 7: Working With the Bash Shell

Question 1

The BASH shell assumes stdout in the absence of a numeric file descriptor. _________________________

Answer 1

True

Question 2

The ENV environment variable represents the location of the BASH run-time configuration file. _________________________

Answer 2

True

Question 3

The file descriptor stdin is represented by the number ____.

A) 0
B) 1
C) 2
D) 3

Answer 3

A

Question 4

You can use the sed command to remove unwanted lines of text.

Question 5

Users can create their own custom variables, called shell variables. _________________________

Question 6

To prevent a file from being cleared by the BASH shell and append output to the existing output, you can specify three > metacharacters alongside the file descriptor.

Question 7

To see a list of the environment variables and their current values on a system, you can use the ____ command.

A) env
B) get
C) set
D) setenv

Question 8

The ____ command counts the number of lines, words, and characters in a file.

A) pr
B) nl
C) tr
D) wc

Question 9

You can redirect a file to the standard input of a command using the ____ metacharacter.

A) >
B) #
C) |
D) <

Question 10

You can send the standard output of one command to another command as standard input using the ____ shell metacharacter.

A) <
B) |
C) >
D) #

Question 11

Given the syntax command && command, the command on the left of the && construct is executed only if the command on the right of the && construct completed successfully.

Question 12

The file descriptor stderr is represented by the number ____.

A) 0
B) 1
C) 2
D) 3

Question 13

Most configuration files on Linux systems are delimited using ____ characters.

A) tab
B) colon
C) space
D) semicolon

Question 14

You are limited to using one pipe | metacharacter on the command line to pipe information from one command to another command.

Question 15

The ____ command can be used to replace characters in a file sent via Standard Input.

A) tr
B) rt
C) ts
D) st

Question 16

In a decision construct, you can have an unlimited number of if then statements. _________________________

Question 17

The ____ command can be used to extract, manipulate, and format text using pattern-action statements.

A) sed
B) grep
C) awk
D) nl

Question 18

Any command that can be executed on the command line can also be placed inside any environment file.

Question 19

You can use the BASH shell to redirect standard output and standard error from the terminal screen to a file on the filesystem using the ____ shell metacharacter followed by the absolute or relative pathname of the file.

A) #
B) <
C) >
D) |

Question 20

Aliases are shortcuts to commands stored in special variables that can be created and viewed using the alias command. _________________________

Question 21

A case construct must be ended by ____________________.

Question 22

To see a list of all exported environment and user-defined variables in the shell, you can use the ____ command.

A) env
B) set
C) setenv
D) getenv

Question 23

The test statement ____ would be used to determine if A is numerically greater than B.

A) [ A -g B ]
B) [ A -ge B ]
C) [ A -gt B ]
D) [ A +eq B ]

Question 24

Match each term with the correct statement below.
a.hashpling
f.decision construct
b.tee
g.shell scripts
c.environment variables
h.stdout
d.stdin
i.file descriptors
e.stderr
Files that are typically used to create custom programs that perform administrative tasks on Linux systems.

Question 25

If you have ____ permission to a shell script, you can execute the shell script like any other executable program on the system.

A) read
B) write and read
C) execute
D) read and execute

Question 26

Match each term with the correct statement below.
a.hashpling
f.decision construct
b.tee
g.shell scripts
c.environment variables
h.stdout
d.stdin
i.file descriptors
e.stderr
Labels representing command input and output.

Question 27

The ____ command could be used to view the contents of the environment variable that represents the BASH shell prompt.

A) ls $PWD
B) echo #PWD
C) echo $PS1
D) ls #PS1

Question 28

The ____________________ environment variable contains a list of directories to search for executable programs.

Question 29

Most commands that are run by the shell are run in a separate ____________________, which is created by the current shell.

Question 30

Match each term with the correct statement below.
a.hashpling
f.decision construct
b.tee
g.shell scripts
c.environment variables
h.stdout
d.stdin
i.file descriptors
e.stderr
A filter command that takes information from standard input and sends that information to a file, as well as to standard output.

Question 31

Match each term with the correct statement below.
a.hashpling
f.decision construct
b.tee
g.shell scripts
c.environment variables
h.stdout
d.stdin
i.file descriptors
e.stderr
The normal output of a command.

Question 32

Match each term with the correct statement below.
a.hashpling
f.decision construct
b.tee
g.shell scripts
c.environment variables
h.stdout
d.stdin
i.file descriptors
e.stderr
Constructs that alter the flow of a program based on whether a command in the program completed successfully or based on a decision that the user makes given a question posed by the program.

Question 33

Match each term with the correct statement below.
a.hashpling
f.decision construct
b.tee
g.shell scripts
c.environment variables
h.stdout
d.stdin
i.file descriptors
e.stderr
The first line in a shell script, which specifies the pathname to the shell that interprets the contents of the shell script.

Question 34

Match each term with the correct statement below.
a.hashpling
f.decision construct
b.tee
g.shell scripts
c.environment variables
h.stdout
d.stdin
i.file descriptors
e.stderr
Shell variables that are typically set by the system and contain information that the system and programs access regularly.

Question 35

The ____ environment file is always executed immediately after login for all users on the system, and sets most environment variables, such as HOME and PATH.

A) ~/.bash_profile
B) ~/.bash_login
C) /etc/profile
D) ~/.profile

Question 36

The ____________________ command takes user input from stdin and places it in a variable specified by an argument.

Question 37

Match each term with the correct statement below.
a.hashpling
f.decision construct
b.tee
g.shell scripts
c.environment variables
h.stdout
d.stdin
i.file descriptors
e.stderr
Any error messages generated by a command.

Question 38

Match each term with the correct statement below.
a.hashpling
f.decision construct
b.tee
g.shell scripts
c.environment variables
h.stdout
d.stdin
i.file descriptors
e.stderr
The information that is processed by the command during execution.

Question 39

Any command that can take standard input and transform it into standard output is called a(n) ____________________ command.

Question 40

The ____ escape sequence represents a form feed.

A) \n
B) \f
C) /f
D) /n

Question 41

What are shell variables? What are environment and user-defined variables?

Question 42

What is a decision construct? What is the most common type of decision construct, and what is the syntax for using it?

Question 43

What are file descriptors? What are the three file descriptors are available to each command that can be manipulated by the BASH shell, and what is the purpose of each?

Question 44

What are shell scripts? Why and how are they executed?

Question 45

Describe the while construct. How and why is it used?