A performant way to work with obtusely large files in PowerShell #Quickie #PowerShell

 I have a pattern that makes working with large text files one-line-at-a-time inpowershelll much more performant by reading in a block of lines and parsing them in memory instead of reading one line at a time.

I've forgotten and re-invented this enough times that I'm writing it here so future me can find it.

get-content $filename -Encoding Unicode -ReadCount 10000 | foreach-object {

    "Working line $i"

    $i+=10000

    foreach ($line in $_) {

        # do something

    } 

}