ErrorAction parameter in PowerShell - Mini Project: Build & Apply

Using the ErrorAction Parameter in PowerShell

📖 Scenario: Imagine you are managing files on your computer using PowerShell. Sometimes, commands might fail, like trying to get a file that does not exist. You want to control how PowerShell handles these errors so your script can continue running smoothly or stop when needed.

🎯 Goal: You will learn how to use the ErrorAction parameter in PowerShell commands to control error handling. You will create a script that tries to get file information and handles errors by stopping or continuing based on the ErrorAction setting.

📋 What You'll Learn

Create a variable with a file path that does not exist

Create a variable to store the error action preference

Use the Get-Item command with the ErrorAction parameter

Print the result or error message

💡 Why This Matters

🌍 Real World

System administrators often run scripts that manage files and resources. Using ErrorAction helps them control what happens when something goes wrong, making scripts more reliable.

💼 Career

Knowing how to handle errors in PowerShell scripts is essential for IT professionals, system administrators, and anyone automating Windows tasks.

1

Create a file path variable

Create a variable called filePath and set it to the string "C:\nonexistentfile.txt".

PowerShell

# Create a variable called filePath with the value "C:\nonexistentfile.txt"
# Your code here

Need a hint?

Use = to assign the string to the variable $filePath.

2

Set the error action preference variable

Create a variable called errorAction and set it to the string "Stop".

PowerShell

$filePath = "C:\nonexistentfile.txt"
# Create a variable called errorAction with the value "Stop"
# Your code here

Need a hint?

The ErrorAction parameter accepts values like Stop, Continue, SilentlyContinue, etc.

3

Use Get-Item with ErrorAction

Use the Get-Item command with the path $filePath and the parameter -ErrorAction $errorAction. Store the result in a variable called fileInfo. Use a try and catch block to handle errors.

PowerShell

$filePath = "C:\nonexistentfile.txt"
$errorAction = "Stop"
# Use try-catch to get the item with ErrorAction and store in fileInfo
# Your code here

Need a hint?

Use try { ... } catch { ... } to catch errors when ErrorAction is set to Stop.

4

Print the result

Print the variable fileInfo to show the file information or the error message.

PowerShell

$filePath = "C:\nonexistentfile.txt"
$errorAction = "Stop"
try {
    $fileInfo = Get-Item -Path $filePath -ErrorAction $errorAction
} catch {
    $fileInfo = $_.Exception.Message
}
# Print the fileInfo variable
# Your code here

Need a hint?

Use Write-Output $fileInfo to display the result or error message.