I was curious what will be the result if the $vm_name was undefined
get-vm -name $vm_name -ErrorAction SilentlyContinue
I did not find any related questions or documentation on this. What i know is undefined variable value is $null but need to know what will be the output of this command
Note: This command was used in VMWare
the output of this command is the VM details of the virtualization server "hyper-v"
as follows:
reference :
https://learn.microsoft.com/en-us/powershell/module/hyper-v/get-vm?view=windowsserver2019-ps
Related
I have a script to manage hyper-v virtual machines. When I execute the command to shut down a machine, I need the warning to be saved in the log if it is shut down.
The script I have only captures the errors, I need to get both errors and warnings:
Try {
Stop-VM $Machine -ErrorAction Stop
} Catch {
Write-Host "Error: $_"
Add-Content -Path $Log -Value "`n$_"
}
Thanks!
Assuming that Stop-VM issues non-terminating errors:
Stop-VM $Machine *> output.log
Note: This redirects all of PowerShell's output streams to file output.log, including success output, if any, and it would work with passing an array of VM names in $Machine.
As Abraham Zinala points out, you can selectively capture (some of the) output streams, in variables, using the the common -WarningVariable parameter as well as -ErrorVariable, which you can later send to a file as needed. Note that using these variables still produces the original stream output, but you can silence that with -WarningAction SilentlyContinue and -ErrorAction SilentlyContinue. See the answer linked below for details.
As Santiago Squarzon points out, you could extend your original approach by adding -WarningAction Stop, but the limitation, as
explained in this answer, is that only the first error or warning emitted by the call is then captured, and, perhaps more importantly, the command is terminated at that point - even if multiple VMs were specified.
Have a local basic Powershell form for searching and creating VMware virtual machines.
Using new powershell powerCLI module, as described in link
Let's take Get-VM for example:
LOGIC: Type a certain string in TextBox > click search > prints VM's status/parameters in the form
The problem is, I can't execute Get-VM straight away from the script, but first have to connect using Connect-VIServer command and only than Get-VM will work
Is there any way to do it from the script? Something similar to -m flag of commands plink or putty.
Like: Connect-VIServer -server testvc -flagForExample "commands_list.txt"
Yes, you can. Before providing an immediate answer I'd like to explain what is actually happening.
When you call Connect-VIServer the command sets the value of the variable $DefaultVIServer behind the scenes, which is later used by other cmdlets (such as Get-VM).
However, the Get-VM documentation states that there is a Server parameter available. Which means that you can store your server connection in a variable and then pass it to the Get-VM cmdlet.
Here's a pseudo-code example:
$server = Connect-VIServer -server testvc
Get-VM -Server $server
Furthermore, the Get-VM supports an array of servers, so theoretically you can run the cmdlet on multiple servers at once. For example:
$server1 = Connect-VIServer -server testvc
$server2 = Connect-VIServer -server testvc2
Get-VM -Server #($server1, $server2)
I'm running the following command from within a Microsoft System Centre Orchestrator PowerShell activity:
Install-WindowsFeature -ConfigurationFilePath C:\DeploymentConfigTemplate.xml -ComputerName ServerXYZ
the command isn't doing what it's supposed to do, and I want to be able to return if the command was successful or not, and any error message if possible. Ignore the fact it's running in Orchestrator, as I'm more concerned about the PowerShell question. When I run the command from ISE it does what it's supposed to do, that's why I want to see what is returned from PowerShell.
Thanks.
It's hard to know what may be happening without more context. The following will record any errors encountered in an xml file that you can import later with import-clixml:
Install-WindowsFeature -ConfigurationFilePath C:\DeploymentConfigTemplate.xml -ComputerName ServerXYZ
IF (!($?)) {
$error[0] | export-clixml C:\myerror.xml
}
This solves my problem:
$Result = Install-WindowsFeature -Name SNMP-Service -IncludeAllSubFeature -IncludeManagementTools
Write-Host $Result.ExitCode
I am making a cmdlet call to 'set-distributiongroup' in powershell 2. I am simply setting the value of the parameter 'hiddenFromAddressListsEnabled' to a pre-defined boolean value.
However, no matter what I try, it displays a warning message if the boolean assignment is not actually changing the current value of 'hiddenFromAddressListsEnabled'.
Here is the main command I'm invoking:
set-DistributionGroup -identity TestGroup `
-hiddenFromAddressListsEnabled=$true
Let's semantically define what I have above as 'command'.
Now, I've tried adding several different variants, all with proper line-continuation and syntax. Here are those variants:
command > $null
command 2> $null
command -ErrorAction:silentlycontinue
command -ErrorVariable $throwAway
command -WarningAction:silentlycontinue
command -WarningVariable $throwAway
$var = command
Regardless of various combinations of one or more of the above, I still get a yellow WARNING: message spit to output. Specifically, this:
WARNING: The command completed successfully but no settings of
'<xxxxxx>/Users/TestGroup' have been modified.
Any suggestions on a key concept I'm not understanding? I want the command to not produce this output, and I want it to silently continue if this occurs.
Thanks!!
I've been trying to suppress the warning messages when stopping a service:
WARNING: Waiting for service 'Service Description' to finish stopping...
The following worked for me:
Stop-Service $svc.Name -WarningAction SilentlyContinue
If it's just a warning that cause problem why don't you set in your script $WarningPreference variable ?
PS C:\> $WarningPreference='silentlycontinue'
PS C:\> Write-Warning "coucou"
PS C:\> $WarningPreference='continue'
PS C:\> Write-Warning "coucou"
AVERTISSEMENT : coucou
just bumped this topic when searching on the issue,
my case PowerShell v2 , only after setting
$WarningPreference = "SilentlyContinue"
Write-Warning "blah" - returned me nothing... the parameter on the command didn't changed much too on my end.
You may be hitting this bug: http://connect.microsoft.com/PowerShell/feedback/details/541500/warning-verbose-and-debug-streams-do-not-respect-action-preferences-the-way-they-should
Anyway, your command should look like:
Set-DistributionGroup -Identity TestGroup -HiddenFromAddressListsEnabled $true
Your command is wrong. Which is the the reason why you get a yellow error message. The command should look like:
Set-DistributionGroup -Identity TestGroup -HiddenFromAddressListsEnabled $true
Or
Set-Distributionaliste -Identity TestGroup -HiddenFromAddressListsEnabled:$true
But not
Set-DistributionGroup -Identity TestGroup -HiddenFromAddressListsEnabled=$true
I was getting the same problem with the Exchange Management Console in 2010. Problem is the EMC runs on PowerShell 2.0, which as stated before has some bugs around warning preferences.
I found a cheeky workaround was to run my script in a vanilla PowerShell 4.0 shell, and then import the EMC cmdlets and start a new remote PS session like so...
. 'C:\Program Files\Microsoft\Exchange Server\V14\bin\RemoteExchange.ps1'
Connect-ExchangeServer -auto
...then, -WarningAction:SilentlyContinue suddenly starts behaving itself.
You should try
Set-DistributionGroup -Identity TestGroup -HiddenFromAddressListsEnabled $true -WarningAction silentlyContinue
I bumped into same issue, the following command seems to do the job (PS 3.0) :
Stop-Service<or whatever command> $svc.Name -WarningPreference SilentlyContinue
Don't know exactly what difference it makes with -WarningAction, though.
Hope this helps !
If you invoke powershell versión 2.0, you should use "-WarningAction silentlyContinue". I was having the same issue, but in the script, if I invoke, for example "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe -versión 2.0" , then you can use this parameter. I was trying on a scheduled task and using a ps1 script.
Try something like that:
PS C:\> {command} | Out-Null
For more Information: Technet: Out-Null
Currently trying to build a script utilizing cmdlets from the MS released "Team Foundation Server Power Tools" package.
I'm attempting to flow command logic from the success or failure of the "Update-TfsWorkspace" cmdlet however I can't seem get a return code out of the call nor can I capture the output using Out-String. I'm using Powershell v1.
update-tfsworkspace "C:\doesnotexist\" -recurse -version T
Yields a message of "Unable to determine the workspace." which is the error I'm trying to catch.
$ret = update-tfsworkspace "C:\doesnotexist\" -recurse -version T
Is expected to give me a $true/$false indicating success/fail but doesn't work.
update-tfsworkspace "C:\doesnotexist\" -recurse -version T | Out-Null
Is expected to prevent the cmdlet from writing the message but doesn't work.
trap{echo "fail"}
update-tfsworkspace $workspace_path -recurse -version T
Is expected to catch an error and write "fail" but doesn't work.
$msg = update-tfsworkspace $workspace_path -recurse -version T | Out-String
Is expected to populate a $msg variable with the host output but doesn't work.
I'm totally out of ideas here. Help would be appreciated!
Little hacky, but since I don't have TFS to try to figure something else out, see if this helps.
I would say that this cmdlet wasn't written correctly. First, since it didn't succeed it should have emitted an error object which would have caused $? to return false which you could have checked or trapped. Second, you can't suppress the error message using -ea 0. It looks like this snapin is using the Host api to write an error string to the host console. That's a spew!! For now, you could do what EBGreen suggests:
$msg = powershell.exe -nologo update-tfsworkspace "C:\doesnotexist\" -recurse -version T 2>&1
Just watch out for all the text your profile script spits out when a new instance of PowerShell starts up.
Your problem here is that the cmdlet is writing an error (Non-Terminating Error), but not throwing an exception (Terminating Error). You can make it throw an exception by adding the ErrorAction parameter:
trap{echo "fail"}
update-tfsworkspace $workspace_path -recurse -version T -ErrorAction "Stop"
This will cause the cmdlet to make all errors terminating (throwing an exception if it writes to the error stream).