# https://github.com/nightroman/SplitPipeline
# Install-Module SplitPipeline
Import-Module SplitPipeline

$urls = [System.IO.File]::ReadAllLines("url.txt")

$urls | Split-Pipeline -Count 4 {   process {  Invoke-Expression "bbdown.exe $_" } } 

echo "所有处理完成"