In PowerShell, which command applies a command to each object in a pipeline and requires a script block?

• A. ForEach-Object
• B. Sort-Object
• C. Test-Connection
• D. Out-Host

Answer: (A)

When you want to do something to every object that flows through a PowerShell pipeline, you need a command that runs a script block for each input item. This is exactly what the per-item processor does. ForEach-Object is designed for this role. It takes each object from the pipeline and executes the script block you provide, with the current object accessible inside the block as $_. This lets you transform, filter, or perform actions on every item as it passes through the pipeline. The shorthand alias for this is the percent sign, which is just a quicker way to write it.

For example, Get-Service | ForEach-Object { $_.Name } would print the name of each service. In contrast, the other commands don’t perform per-item scripting: Sort-Object focuses on ordering items, Test-Connection checks reachability, and Out-Host simply writes output to the screen.