02

Question 1

what data types aren’t available with BASH. Python, and PowerShell/?

Answer 1

only strings, no characters, it has everything

Question 2

An ________ is zero-based index

Answer 2

array

Question 3

what does python call arrays?

Answer 3

lists

Question 4

An ______ is known as an instance of a class

when do these exist?

Answer 4

object

not until the programmer instatiates them

Question 5

An _______is a blueprint that contains the abstract details of a thing

classes are defined in a ______

Answer 5

class

file

Question 6

___________ provides a means to access the data and methods of an object

Answer 6

dot notation

Question 7

__________ is a method of temporarily changing a value from one data type to another to ensure a variable is processed correctly

Answer 7

typecasting

Question 8

__________________ defines where a variable is accessible and how long its value is available.

Answer 8

variable scope

Question 9

A________ is a named section of a script that performs a specific task

Answer 9

function

Question 10

What does each return statement do?

return
return total
return 3.14

Answer 10

returns no value

reutns the value of the created method called sum

returns the value of 3.14

• all of these are reutned to wherer the function was originally called

Question 11

___________ commonly refers to directing input and output to files and devices other than default input/output (I/O) devices

What is the stream number for each of these data streams?

STDIN
STDOUT
STDERR

What do these redirection symbols mean?
>&
<

Answer 11

redirection

STDIN 0
STDOUT 1
STDERR 2

redirects two separate data streams to the same place STDIN + STDERR in one file

Reads a file

Question 12

____________ are strings that describe data or data patterns for which a user wishes to search

Answer 12

Regular expressions

Question 13

What does each regx meta character do?

[ ]
{ }
*
?
^ (^been)
$
.
( )

|

Answer 13

[ ] matches only one out of a list

{ } lets me specify the number of what was prevously entered to search for

• indicates one or more of an item

? tells zero or one of the previous token

^(^been) if the carat is on the outside of a parenthesis its searching something that begins with the value inside, if its inside then saying these variables are not allowed

$ no data comes after

. wild card search for any character

creates a group of objects

is an or statement

Question 14

/d

/w

/W

/s

/S

what does these mean

{0,6}
{1.}
{1,10)

Answer 14

any number 0-9

any lower case characters

any uppercase characters

any whitespace charcter

any non-whitespace character

zero to 6 string length
minumum of one character or more
minimum of one charcter maximum of ten

Question 15

Using ______________ data matched in a group may also be repeated in an expression

Answer 15

back references

Question 16

what does (/w[a,b,c]def) /1

Answer 16

copies group one so its is repeated again at this spot