Controlling The Flow Of PS Functions

Question 1

Comparison operator syntax

Answer 1

Variables

$variable = “value”
$variable = “value”

If($variable -eq $comparevariable)

Question 2

Greater than comparison operator

Answer 2

Variables

$variable = “1”
$variable = “2”

If($variable -gt $comparevariable)

Question 3

Like comparison operator

Answer 3

Variables

$variable = “value”
$variable = “value”

If($variable -like $comparevariable)

Question 4

Match comparison value

Answer 4

Variables

$variable = “value”
$variable = “value”

If($variable -match $comparevariable)

Question 5

What are collection operators?

Answer 5

Variables

Each item in collection is evaluated, and the operator returns every value that is true.

$array = 1..10
$comparevariable = 6

If($array -gt $comparevariable)

If($array -contains $comparevariable)

If($comparevariable -in $array)

Question 6

What are logical operators?

Answer 6

Used to invert or combine other expressions. You can connect multiple statements, allowing you to use a single expression to test for numerous conditions.

Question 7

What is a ternary operator?

Answer 7

IF one equals two, question mark = True and colon = False

A new syntax for IF / ELSE statements

1. Condition
2. IF true
3. IF false

($variableOne -eq $variableTwo) ? $true : $false
($variableOne -eq $variableTwo) ?
(“$variableOne : $variableTwo”) : (“$variableOne ; $variableTwo”)

Question 8

How to create an array from 1 to 10?

Answer 8

$array = 1..10

Question 9

If an array is created 1 - 10, and the variable compare is created with a value of 6, how would you compare that the value in compare is found in the array in two different ways?

Answer 9

If($array -contains $compare) {
Write-Host “Compared” }

If($compare -in $array) [
Write-Host “Compared” }

Question 10

You have an array of 1 to 10, and a variable compare with a value of 8. Write a script to check if variable compare is included in the array, and if the variable compare is greater than 8. If it is output Yes, if it is not, output No.

Answer 10

If(($compare -in $array) -and ($compare -gt 8)) { Write-Host “Yes” } else { Write-Host “No” }

Question 11

Considering variable1 = 1 and variable2 = 3, write a script using the new scripting version that determines if variable1 is equal to variable2. If it is output true, if it is not, output false.

Answer 11

If($variable1 -eq $variable2) ? $true : $false

Question 12

What is a loop?

Answer 12

A construct that allows you to produce a sequence of instructions inside code, iterating several times as long as the defined condition is met

Question 13

What is a for loop?

Answer 13

Iterates through commands a specified number of time

Easy as you commonly know the number of time to loop ahead of time

Question 14

What is a while loop?

Answer 14

Repeats a command or a group of commands when the given condition is true

Entry controlled loop

Test condition before the execution of the first iteration

Question 15

What is a do-while loop?

Answer 15

Condition/Do-While is executed first, then the condition test is at the end of the loop

Exit controlled loop

Tests the condition after the execution of the first iteration.

Question 16

What is a do-until loop?

Answer 16

Loop repeats until the condition returns true

They are the opposite of the Do-While loop

Do { } Until ( )

Question 17

what is a foreach-object?

Question 18

What is a foreach statement or loop?

Question 19

What is a foreach() method?

Question 20

What happens with an entry loop?

Answer 20

Test condition is checked BEFORE entering the loop

Question 21

What happens with an exit loop?

Answer 21

Test condition is checked AFTER executing the loop

Question 22

Entry vs Exit loop

Answer 22

Variable

$number = 1

While ($number -le 10) { $number; $number++ }

Do { $number; number++ } While($number -le 10)

Question 23

What is the Do-While syntax?

Answer 23

Do squiggly brackets While parenthesis/condition

Do { command sequence } While (condition)

Question 24

What are switch statements?

Answer 24

Alternate syntax for doing multiple comparisons with a value

Question 25

If you have an IF statement with an ELSE….

Answer 25

The ELSE statement is the default is nothing matches

Question 26

What is basic switch statement syntax?

Answer 26

Switch (expression) {
Condition1 { code }
Condition2 { code }
Condition3 { code }

$number = 3
# the Switch option means in this statement variable number is the number or object you wish to test
# 5, 10, and 20 are the comparison operators or chosen values to test against
Switch ($number) {
5 { Write-Host “Number equals 5” }
10 { Write-Host “Number equals 10” }
20 { Write-Host “Number equals 20” }
Default. { Write-Host “Number is not equal to 5, 10, or 20” }
}

Question 27

What does Default mean in a Switch statement?

Question 28

What are foreach enumerators?

Answer 28

Scripting language construct that iterates through COLLECTIONS of items

Question 29

what is in a foreach loop statement?

Answer 29

Item - the variable contain the current item
Collection - objects such as files, numbers, or other object types
Script Block - sequence of commands to be executed against each item in the collection

Question 30

What is the base syntax for foreach?

Answer 30

ForEach (Item In Collection) {
CODE or SEQUENCE OF COMMANDS
}

Question 31

Foreach is used when sorting through a ……

Answer 31

Collection of data

Question 32

Foreach structure expanded

Answer 32

$collection = 1..3

ForEach ($number in $collection) {
Write-Host “Current Number: $collection”
}

Question 33

What is $number in:

ForEach ($number in $collection) {
Write-Host “Current Number: $collection”
}

Answer 33

A variable

Question 34

What is in called in the following:

ForEach ($number in $collection) {
Write-Host “Current Number: $collection”
}

Answer 34

An operator

Question 35

What is the syntax for a basic PS command?

Answer 35

Verb-Noun -parameter value -anotherparameter another value -switch

Question 36

What is the parameter, noun, verb, and value of?

Get-EventLog Application -Newest 5

Answer 36

Verb = Get-EventLog
Noun = Application
Parameter = -Newest
Value = 5

Question 37

What characters are required to group arrays, collections, and lists?

Answer 37

Brackets. [ ]

Question 38

When you know the command you want to use but need guidance about exactly how to use it, what do you type?

E.g. for Get-Process

Answer 38

Get-Help Get-Process | more