Conditional Statements

Conditional Statements

In PowerShell, conditional statements are used to execute different blocks of code based on certain conditions. These statements help control the flow of your script.

### 1. If Statement

The if statement is used to check if a condition is true or false. If the condition is true, the code within the if block will be executed.

powershell
# Example: Check if a file exists
$file = "C:\temp\example.txt"
if (Test-Path $file) {
    Write-Host "$file exists"
} else {
    Write-Host "$file does not exist"
}

### 2. If-Else Statement

The if-else statement is similar to the if statement, but it also provides an alternative code block to execute if the condition is false.

powershell
# Example: Check if a file exists and delete it if true
$file = "C:\temp\example.txt"
if (Test-Path $file) {
    Remove-Item $file
    Write-Host "$file deleted successfully"
} else {
    Write-Host "$file does not exist"
}

### 3. Switch Statement

The switch statement is used to compare a value against multiple conditions and execute the corresponding code block.

powershell
# Example: Determine the day of the week based on a number
$day = 2
switch ($day) {
    {$_ -eq 1} { Write-Host "Monday" }
    {$_ -eq 2} { Write-Host "Tuesday" }
    {$_ -eq 3} { Write-Host "Wednesday" }
    {$_ -eq 4} { Write-Host "Thursday" }
    {$_ -eq 5} { Write-Host "Friday" }
    {$_ -eq 6} { Write-Host "Saturday" }
    Default { Write-Host "Unknown day" }
}

### 4. Case Statement

The case statement is used to compare a value against multiple conditions and execute the corresponding code block.

powershell
# Example: Determine the month based on a number
$month = 5
switch ($month) {
    {$_ -eq 1} { Write-Host "January" }
    {$_ -eq 2} { Write-Host "February" }
    {$_ -eq 3} { Write-Host "March" }
    {$_ -eq 4} { Write-Host "April" }
    {$_ -eq 5} { Write-Host "May" }
    {$_ -eq 6} { Write-Host "June" }
    Default { Write-Host "Unknown month" }
}

These are the basic conditional statements in PowerShell. They help control the flow of your script and make it more dynamic and efficient.