Deck 9: File and Folder Administration

Question 1

By default, a computer receives standard input ( STDIN ) from the keyboard

Answer 1

True

Question 2

Ruby allows you to delete both files and folders using the File and Dir classes's delete methods.

Answer 2

True

Question 3

When executed on Microsoft Windows, Ruby program file and path data must be specified using the backslash character.

Answer 3

True

Question 4

By default, a computer sends standard output ( STDOUT ) to the computer's hard drive.

Question 5

Ruby lists the contents of a folder using the Dir class's files method.

Question 6

Ruby allows you to create new folders using the Dir class's creatdir method.

Question 7

Using the File class's folder? method, you can determine if a resource is a folder or something else (socket, pipe, etc.).

Question 8

If you attempt to delete a file or folder that does not exist, or if you try to delete a folder that is not empty, Ruby will ignore the error and substitute an empty file.

Question 9

Ruby allows you to rename a file using the File class's rename method.

Question 10

To determine if a file or folder exists, use the File class's exist? method.

Question 11

The File class gives you access to various file administration methods.

Question 12

The File class also contains a method named file? , which can be used to determine whether a resource is a file or something else.

Question 13

The Dir class's entries method returns the contents of the folder as an array.

Question 14

One limitation within Ruby programming is the inability to redirect STDIN and STDOUT .

Question 15

The Folder class gives you access to various folder administration methods.

Question 16

The operating system, and not Ruby, provides both the > and the redirection operators.

Question 17

Given a script named DispMsg.rb, if an empty file were used as input to: ruby DispMsg.rb a value of nil would be assigned to the message variable in the statement: message = STDIN.gets

Question 18

The movement of data from one place to another is referred to as data input and data output.

Question 19

The Dir class's size method returns a count of the specified file's size in bytes.

Question 20

To determine if a file has any data in it, you can use the File class's size method.

Question 21

To determine if a file or folder exists, use the File class's ____ method.

A) file?
B) value
C) exist?
D) found?

Question 22

Which of the following File class methods can be used to determine if a file or folder exists?

A) location?
B) found?
C) exist?
D) file?

Question 23

Which of the mode options opens a file for writing only, overwriting any existing text by placing the pointer at the beginning of the file.

A) w
B) w+
C) a
D) a+

Question 24

If an empty file were used as input to the operator, a ____ value is returned.

A) empty string
B) nil
C) zero
D) null

Question 25

Which of the following Dir class methods can be used to create a new folder?

A) mkdir
B) createdir
C) mk
D) create

Question 26

Which of the following characters can be used as a shortcut for representing resources stored within the current working directory?

A) _
B) -
C) .
D) @

Question 27

RUBY_PLATFORM contains a string that identifies the type of operating system on which a script is executing.

Question 28

Which of the following File class methods can be used to determine if a file has any data in it?

A) length
B) size?
C) name?
D) size

Question 29

Which of the mode options opens a file for reading only?

A) r
B) r+
C) a
D) a+

Question 30

Which of the following is the Ruby redirection output operator?

A) =
B) =>
C) >
D) ^

Question 31

Which of the mode options opens a file for both reading and writing, overwriting any existing text. If the specified file does not exist, it is created.

A) w
B) w+
C) a
D) a+

Question 32

If you develop a script that will run on different operating systems, you will need a way to determine which type of operating system your script is currently executing on. One way to do this is by taking advantage of Ruby's RUBY_PLATFORM special variable.

Question 33

RUBY_PLATFORM contains a string that identifies the manufacturer of the operating system on which a script is executing.

Question 34

Which of the following File class methods can be used to determine if a resource is a folder or something else?

A) directory?
B) file?
C) found?
D) type?

Question 35

Which of the mode options opens a file for both reading and writing?

A) r
B) r+
C) a
D) a+

Question 36

When executed on UNIX or Linux, Ruby program file and path data must be specified using the backslash character.

Question 37

A special variable is a specially named variable that once you have defined it, is automatically updated by Ruby during program execution.

Question 38

Which of the following File and Dir methods can be used to delete both files and folders?

A) remove
B) delete
C) kill
D) del

Question 39

Which of the following File class methods can be used to determine if a resource is a file or something else?

A) directory?
B) file?
C) found?
D) type?

Question 40

Which of the following Dir class methods can be used to return a list of the contents of a folder in the form of an array.

A) list?
B) entries
C) collection
D) content

Question 41

Which of the following File class methods can be used to change a file's name?

A) change
B) update
C) modify
D) rename

Question 42

Which of the mode options opens a file in append mode, allowing for both reading and writing while preserving any preexisting text.

A) w
B) w+
C) a
D) a+

Question 43

A reference can be set up for a file using which of the following File methods?

A) new
B) existing
C) open
D) file

Question 44

What type of variable is the RUBY_PLATFORM special variable?

A) integer
B) float
C) bignum
D) string

Question 45

Which of the following best describes a special variable?

A) It is a variable specified by the programmers and maintained by Ruby.
B) It is a variable automatically created by Ruby but for which the programmer must assign an initial value.
C) It is a variable that is automatically created and maintained by Ruby.
D) It is a variable that is automatically created by Ruby for its use only.

Question 46

Which of the following methods can be used to open a file for reading?

A) new
B) access
C) open
D) process

Question 47

Which of the following is a special variable containing a string that identifies the type of operating system on which a script is executed?

A) RUBY_SYSTEM
B) RUBY_PLATFORM
C) RUBY_OSTYPE
D) RUBY_TYPE

Question 48

Which of the mode options opens a file in append mode, preserving any preexisting text while allowing new text to be added to the end of the file.

A) w
B) w+
C) a
D) a+

Question 49

Which of the following actions occur if you attempt to delete a file or folder that does not exist?

A) Ruby ignores the error and allows the program to continue
B) Ruby deletes any files found in the current working directory
C) An error is generated and program execution terminates
D) None of the above