Is my file fragmented?

Small function to determine if a file is fragmented - for instance to analyzed an .ldf/.mdf file.
The function below also demonstrates one way to invoke an external command/tool (in this case "contig.exe" from www.sysinternals.com).
The function requires contig.exe to be in the local path.

function getFileFragments {
    $filename = $args[0]
    $contigOutput = contig -a $filename
    foreach ($line in $contigOutput) {
        if ($line -match "Average fragmentation") {
            $splitline = $line.split(' ')
            $x = $splitline.count
            Write-Host $splitline[$x -2]
        }
    }
}

Usage:

getFileFragments "c:\boot.ini"