Powershell to run a bunch of commands in new processes, wait until they're all done and output all the stdout/stderr. If one of the commands returns non-0 exit code then entire script returns 1

Forkinator.ps1

#To add more commands, hack them into the $commands array:
$commands = @(
	@{"cmd" = "D:\Documents\Powershell\battwo.bat"; "args" = "yo"},
	@{"cmd" = "D:\Documents\Powershell\batone.bat"; "args" = "yo2"}
);

$jobs = @();
foreach($cmd in $commands) {
	$startinfo = new-object System.Diagnostics.ProcessStartInfo
	$startinfo.FileName = $cmd.cmd;
	$startinfo.Arguments = $cmd.args;
	$startinfo.WindowStyle = "Hidden";
	$startinfo.CreateNoWindow = $True;
	$startinfo.RedirectStandardError = $True;
	$startinfo.RedirectStandardOutput = $True;
	$startinfo.UseShellExecute = $False;
	$jobs += @{ 
			"process" = [System.Diagnostics.Process]::Start($startinfo);
			"startInfo" = $startinfo;
		};
}

$hasError=$false
foreach($job in $jobs) {
	Write-Host "================ Process ===================="
	Write-Host $job.process.Id ":" $job.process.startInfo.FileName $job.process.startInfo.Arguments
	Write-Host "================= Output ===================="
	$job.process.StandardOutput.ReadToEnd()
	$stderr = $job.process.StandardError.ReadToEnd()
	if($stderr) {
		[Console]::Error.Write($error)
	}
	if($job.process.ExitCode -ne 0) {
		$hasError=$true
	}
	Write-Host "=================== End ====================="
}
if($hasError){
	#Write-Error "OMG, there has been an error! please check the above output";
	[Console]::Error.WriteLine("OMG, there has been an error! please check the above output")
	exit 1;
}