Looping in Powershell I-CodePudding

I would like to run a powershell script where I can loop a command until it comes back false.

tnc -ComputerName [Address] -port [port]
Start-Sleep -s 5

The script is run every 5 seconds

ComputerName     : [Address]
RemoteAddress    : IP
RemotePort       : Port
InterfaceAlias   : WiFi
SourceAddress    : [Address]
TcpTestSucceeded : True

I need this to run every 5 seconds but only show on false then extract to a doc and continue running.

I don't know if this is possible, but any help

CodePudding user response：

The logic would look like this, note that, there are many variations for this. It's up to you.

DateTime.ToString('u') will have the following format for TimeStamp:

//    u Format Specifier      de-DE Culture                     2008-10-31 17:04:32Z
//    u Format Specifier      en-US Culture                     2008-10-31 17:04:32Z
//    u Format Specifier      es-ES Culture                     2008-10-31 17:04:32Z
//    u Format Specifier      fr-FR Culture                     2008-10-31 17:04:32Z

Source: https://docs.microsoft.com/en-us/dotnet/api/system.datetime.tostring?view=net-6.0

$log = do # Do this
{
    # Store the result of TNC in this variable to be tested until(...) is False
    $tnc = Test-NetConnection -ComputerName [Address] -Port [port] |
    Select-Object @{
        Name = 'TimeStamp'
        Expression = { [datetime]::Now.ToString('u') }
    }, RemoteAddress, RemotePort, TcpTestSuceeded

    # Return this variable so it's captured in $log Variable to export the log later
    $tnc 
    Start-Sleep -Seconds 5
}
until ($tnc.TcpTestSuceeded) # Until this property is $False

$log | Export-Csv path/to/logfile.csv -NoTypeInformation

CodePudding user response：

Something like this. But the timeout of a down connection is ridiculously long at about 30 seconds.

while ( -not (tnc yahoo.com -port 81) ) { sleep 5 }

WARNING: TCP connect to (2001:4998:24:120d::1:1 : 81) failed
WARNING: TCP connect to (2001:4998:124:1507::f001 : 81) failed