Logical operators (-and, -or, -not) in PowerShell - Step-by-Step Execution

Concept Flow - Logical operators (-and, -or, -not)

Evaluate first condition

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Evaluate second condition

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Apply -and / -or / -not

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Result: True or False

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Use result in script decision

Logical operators combine or invert true/false conditions to decide script flow.

Execution Sample

PowerShell

$a = $true
$b = $false
$result1 = $a -and $b
$result2 = $a -or $b
$result3 = -not $b
Write-Output "$result1, $result2, $result3"

This script tests -and, -or, and -not with true and false values and prints results.

Execution Table

Step	Expression	Evaluation	Result
1	$a -and $b	True -and False	False
2	$a -or $b	True -or False	True
3	-not $b	-not False	True
4	Write-Output	Outputs results	False, True, True

💡 All logical operations evaluated and results output, script ends.

Variable Tracker

Variable	Start	After Step 1	After Step 2	After Step 3	Final
$a	True	True	True	True	True
$b	False	False	False	False	False
$result1	Undefined	False	False	False	False
$result2	Undefined	Undefined	True	True	True
$result3	Undefined	Undefined	Undefined	True	True

Key Moments - 3 Insights

Why does $a -and $b result in False even though $a is True?

Because -and requires both sides to be True. Here $b is False, so the whole expression is False (see execution_table step 1).

What does -not do to a False value?

-not reverses the value. So -not False becomes True (see execution_table step 3).

Why is $a -or $b True when $b is False?

-or needs only one True side. Since $a is True, the whole expression is True (see execution_table step 2).

Visual Quiz - 3 Questions

Look at the execution table, what is the result of $a -and $b at step 1?

A True

B False

C Undefined

D Error

💡 Hint

Check the 'Result' column in execution_table row for step 1.

At which step does the script output the final results?

A Step 2

B Step 3

C Step 4

D Step 1

💡 Hint

Look for the Write-Output action in the execution_table.

If $b was True instead of False, what would $result1 be after step 1?

A True

B False

C Undefined

D Error

💡 Hint

Recall that -and returns True only if both sides are True (see key_moments about -and).

Concept Snapshot

Logical operators combine true/false values:
 -and: True if both true
 -or: True if any true
 -not: reverses value
Use to control script decisions based on conditions.

Full Transcript

This lesson shows how PowerShell logical operators -and, -or, and -not work. We start with two variables: $a is True, $b is False. We test $a -and $b which is False because both must be True. Then $a -or $b is True because only one side needs to be True. Finally, -not $b reverses False to True. The script outputs these results. Understanding these helps decide what code runs based on conditions.