Deck 8: Working With the Bash Shell

Question 1

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

Answer 1

True

Question 2

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

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

Answer 2

A

Question 3

You can redirect a file to the Standard Input of a command using the ____ metacharacter.

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

Answer 3

D

Question 4

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 5

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

Question 6

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

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

You can send the Standard Output of one command to another command as Standard Input using the ____ shell metacharacter.

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

Question 9

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 10

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

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

Question 11

stderr is represented by the number ____.

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

Question 12

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

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

Question 13

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 14

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 15

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

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

Question 16

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 17

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 18

The ____ escape sequence represents a form feed.

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

Question 19

stdin is represented by the number ____.

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

Question 20

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 21

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 22

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

Question 24

Describe the && and || constructs. How and why are they used?

Question 25

Any command that can take from Standard Input and give to Standard Output is called a(n)____________________ command.

Question 26

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

Question 27

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

Question 28

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 29

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

Question 30

A case construct must be ended by ____________________.

Question 31

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

Question 32

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