How to convert this windows batch file into an equivalent Powershell script?

Question

I'm trying to convert this windows .BAT file (which runs a Client & Server networked code app) into Powershell :

Here is my bat file :

@echo off
setlocal


start cmd

start java FixedMessageSequenceServer

ping 192.0.2.2 -n 1 -w 5000 > null

start /wait java FixedMessageSequenceClient

if errorlevel 1 goto retry

echo Finished successfully
exit

:retry
echo retrying...
start /wait java BatchWakeMeUpSomehow

Here is my Powershell file :

Start-Job -ScriptBlock {
  & java FixedMessageSequenceServer 
  Start-Sleep -s 1
  & java FixedMessageSequenceClient
}




Start-Sleep -s 1

But when I try to run, it doesn't output correctly or do anything. I'm also not sure how to convert the start /wait.

@Mofi - I want to have both server and client write to a single window, rather than having output going to two separate CMD windows. I need to then be able to force shutdown this one window( it containing both server and client messages), and then restart it automatically ( see this question ) — Caffeinated
– Caffeinated, Commented Feb 22, 2016 at 6:41

Mathias R. Jessen · Accepted Answer · 2016-02-22 07:47:40Z

2

The start external call operator in cmd is roughly equivalent to Start-Process (alias start) in PowerShell - it even has a -Wait parameter.

Start-Job on the other hand launches your scriptjob in a background process.

Start-Process java FixedMessageSequenceServer
Start-Sleep -Seconds 1
$JavaClient = Start-Process java FixedMessageSequenceClient -Wait -PassThru

if($JavaClient.ExitCode)
{
    # exit code is non-zero, better retry
    Start-Process java BatchWakeMeUpSomehow -Wait
}

edited Feb 22, 2016 at 7:47

answered Feb 22, 2016 at 7:40

Mathias R. Jessen

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2 Comments

user4003407 Over a year ago

AFAIK, Start-Process does not update $LASTEXITCODE variable, so you have to use -PassThru and inspect ExitCode property of returned Process object.

Caffeinated Over a year ago

Ok, so I ran this - but it's not behaving exactly like I want yet. I'd like to be able to type CTRL+C to kill the client-server pair while they're both running, then have it restart. curious tho, what is the -Wait flag for?

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