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let background job write to screen RRS feed

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    Is there a way to write a script like this, run it in the background, but still allow it to write to the terminal?

    while (1) { echo hi; sleep 1 }    


    • Edited by JS2010 Saturday, September 16, 2017 6:35 PM
    Saturday, September 16, 2017 6:34 PM

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    You just did.  That line will write to the console -- we don't call it a terminal -- even if the console is running in the "background".

    \_(ツ)_/

    Saturday, September 16, 2017 7:25 PM
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    Yeah but I want it to run in the background like this:

    start-job { while (1) { echo hi; sleep 1 } } 



    • Edited by JS2010 Saturday, September 16, 2017 8:06 PM
    Saturday, September 16, 2017 8:06 PM
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    Do you have a question?  Are you asking how to get the output?

    help Receive-Job -Full

    A task running in a separate session cannot output to a different session.  You can possible use a runspace and a synchash to get an output.

    \_(ツ)_/


    • Edited by jrv Saturday, September 16, 2017 8:12 PM
    Saturday, September 16, 2017 8:10 PM
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    Yes, I want to do like this in unix.  I can still run other commands, but output will still come to the same screen by itself.

    while true; do echo hi; sleep 1; done &




    • Edited by JS2010 Saturday, September 16, 2017 8:41 PM
    Saturday, September 16, 2017 8:40 PM
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    There is no command in PowerShell to push a command into the background.  We can only use runspaces and synchashes.

    \_(ツ)_/

    Saturday, September 16, 2017 8:49 PM
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    Example of a runspace that writes to the console:

    #https://learn-powershell.net/2013/04/19/sharing-variables-and-live-objects-between-powershell-runspaces/

$code = {
	while(1){
		$hash.host.Ui.WriteLine('Hello World!')
		sleep 2
    }
}

$hash = [hashtable]::synchronized(@{ })
$hash.Result = ''
$hash.host = $host
$runspace = [runspacefactory]::createrunspace()
$runspace.open()

$runspace.sessionstateproxy.setvariable('hash', $hash)
$pipeline = $runspace.createpipeline($code)
$pipeline.input.close()
$pipeline.invokeasync()

# to terminate runspace type "$runspace.Close();$runspace.Dispose()"

    \_(ツ)_/

    Saturday, September 16, 2017 10:32 PM
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    It can somewhat be done like this.

    $a = start-process -NoNewWindow powershell 'while (1) { echo hi; sleep 1 }' -PassThru
    hi
    hi
    hi
    stop-process $a

    • Edited by JS2010 Monday, October 7, 2019 7:58 PM
    Monday, October 7, 2019 7:53 PM