Split files with Powershell

SplitFile.ps1

param(  [string]$file = $(throw "file is required"),$maxFiles = [Int32]::MaxValue, $upperBound = 500MB )
# with a little help of https://gist.github.com/awayken/5861923
$ErrorActionPreference = "Stop";

trap {
    $ErrorActionPreference = "Continue"
    write-error "Script failed: $_ \r\n $($_.ScriptStackTrace)"
    exit (1);
}

$file = (resolve-path $file).path

$fileNameExt = [IO.Path]::GetExtension($file)
$fileNameWithoutExt = [IO.Path]::GetFileNameWithoutExtension($file)
$fileNameDirectory = [IO.Path]::GetDirectoryName($file)

$fromFile = [io.file]::OpenRead($file)

$buff = new-object byte[] $upperBound
 
$count = $idx = 0

try {
    "Splitting $from using $upperBound bytes per file, with a max of $maxFiles files"
    do {
        $count = $fromFile.Read($buff, 0, $buff.Length)
        if ($count -gt 0) {
            $to = [IO.Path]::Combine($fileNameDirectory, "$fileNameWithoutExt.$idx$fileNameExt")
            $toFile = [IO.File]::OpenWrite($to)
            try {
                "Writing to $to"
                $tofile.Write($buff, 0, $count)
            } finally {
                $tofile.Close()
            }
        }
        $idx ++
    } while ($count -gt 0 -and ($idx -lt $maxFiles))
}
finally {
    $fromFile.Close()
}