Stream a Text File Line by Line in PowerShell

function Read-FileLine {
    param(
        [Parameter(Mandatory)][string]$Path,
        [scriptblock]$OnLine = { param($line) $line }
    )
    $count = 0
    foreach ($line in [System.IO.File]::ReadLines($Path)) {  # lazy, never loads the whole file
        if ([string]::IsNullOrWhiteSpace($line)) { continue }
        & $OnLine $line
        $count++
    }
    Write-Verbose "Read $count non-empty lines from $Path"
}