Error Action
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Error Action Premsitimingconfigaction Failed During Execution
Guy (PowerShell) Networking Identity, Access & Security Datacenter and Private Cloud Security Active Directory Enterprise Mobility Ask Directory Services Windows PowerShell Blog Automating the world one-liner at a time… -ErrorAction and -ErrorVariable ★★★★★★★★★★★★★★★ November 2, 2006 by PowerShell Team // 15 Comments 0 0 0 Let me takea minute to tell you about 2 of my favorite things in Windows PowerShell: -ErrorAction and –ErrorVariable You may have heard me talk about being maniacal about doing a great job with error handling … this is one the cornerstones of our architecture. Here is the background: Cmdlets are implemented by subclassing a base class. The engine reflects against this class looking for public properties that have a .net attribute on them identifying them as a PARAMETER. Why is this a good idea? Well think about it, the base class can also have public properties with the PARAMETER attribute. And that's exactly
PowerShell -ErrorAction SilentlyContinue If a PowerShell script halts, or a portion of the code does not work, what action
Error Action Postmsitimingconfigaction Failed During Execution
do you want the error to trigger? One popular solution is error action launchlocalbootstrapaction threw an exception during execution to tell the script to silently continue.Windows PowerShell -ErrorAction SilentlyContinue -ErrorAction Example: Check If a Service Has error action preference Been Installed Problems With Stop-Process Problems Displaying Registry Hives Research -ErrorAction Stop ♣ -ErrorAction Example: Check If a Service Has Been Installed # PowerShell -ErrorAction SilentlyContinue example Clear-Host https://blogs.msdn.microsoft.com/powershell/2006/11/02/erroraction-and-errorvariable/ $SrvName = "Printer Spooler"$Service = Get-Service -display $SrvName -ErrorAction SilentlyContinue if (-Not $Service) {$SrvName + " is NOT installed check the name."} else {$SrvName + " is installed." $SrvName + "'s status is: " + $service.Status } Note 1: While this example shows -ErrorAction, you must decide if it's better than the built-in message ObjectNotFound.Action Point remove http://www.computerperformance.co.uk/powershell/powershell_erroraction_silentlycontinue.htm -ErrorAction SilentlyContinue from the above script. Note 2: The actual name of this service is Print Spooler (not Printer). I made this deliberate mistake so as to create the error message. Problems With Stop-Process Scenario you create a PowerShell script which will kill several processes. The problem arises when the first process does not exist, consequently the script comes to a halt prematurely. "Cannot find a process with the process identifier 5132" Zapping processes is a classic job for SilentlyContinue ... provided you know what you're doing! If you would like to try this for real, then launch Task Manager and note the PID (process ID) of one real and two fictitious processes. Then substitute your PIDs for 5132, 5075, 5072 in my script below. # PowerShell SilentlyContinueClear-HostStop-Process 5132, 5075, 5072 -ErrorAction SilentlyContinue Note 3: Please don't use Stop-Process unless you understand what you are doing, for instance, you make a 'walk-though' of stopping the process with task manager. Guy Recommends: Free WMI Monitor for PowerShell Window
can only use ErrorAction on cmdlets or functions that support Common Parameters. You cannot use ErrorAction with if statement or switch statement because they do not support Common Parameters. For https://superwidgets.wordpress.com/2014/12/22/powershell-erroraction/ example: $Duration = Measure-command { $e = Get-ChildItem -Path e:\ -Recurse -Force } "Got $($e.Count) files in $($Duration.Minutes):$($Duration.Seconds) mm:ss" that will produce error if it cannot read some http://scriptlore.com/powershell/erroraction/ files like: Get-ChildItem : Access to the path ‘E:\System Volume Information' is denied. At line:1 char:36 + $Duration = Measure-command { $e = Get-ChildItem -Path e:\ -Recurse -Force } error action + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + CategoryInfo : PermissionDenied: (E:\System Volume Information:String) [Get-ChildItem], UnauthorizedAccessException + FullyQualifiedErrorId : DirUnauthorizedAccessError,Microsoft.PowerShell.Commands.GetChildItemCommand Options Ignore: can only be used as a cmdlet/function parameter and not as an ErrorAction Preference. Suspend: applies to workflows only Inquire: very similar to the -Debug parameter. It offers the options to continue, suspend, or halt the cmdlet/function. There's no ErrorAction option failed during execution to stop without giving an error message. Applies to one cmdlet/function You must use the -ErrorAction parameter with the cmdlet/function where the error happens. For example: $Duration = Measure-command { $e = Get-ChildItem -Path e:\ -Recurse -Force } -ErrorAction Ignore "Got $($e.Count) files in $($Duration.Minutes):$($Duration.Seconds) mm:ss" If the intent is to suppress the error message, this won't work because the error was generated by the Get-ChildItem cmdlet not the Measure-Command cmdlet. However, this example will suppress the error: $Duration = Measure-command { $e = Get-ChildItem -Path e:\ -Recurse -Force -ErrorAction Ignore } "Got $($e.Count) files in $($Duration.Minutes):$($Duration.Seconds) mm:ss" Default ErrorAction Default ErrorAction is Continue. This is controlled by the $ErrorActionPreference Preference Variable. For example: $Push_Pop = $ErrorActionPreference $ErrorActionPreference = "SilentlyContinue" $Duration = Measure-command { $e = Get-ChildItem -Path e:\ -Recurse -Force } "Got $($e.Count) files in $($Duration.Minutes):$($Duration.Seconds) mm:ss" $ErrorActionPreference = $Push_Pop will suppress the error. . Terminating versus non-terminating errors A terminating error stops execution. Specifically, a cmdlet/function calls the ThrowTermiatingError method. It permanently stops the execution of the pipeline. A non-terminating error writes to
kind of explains itself when you think of it. Basically it instructs PowerShell what action to take when an error occurs. The actions you can set are Continue (which is default), Stop, SilentlyContinue and Inquire. Let’s take a look. Continue You can verify that Continue is the default action by looking at the $ErrorActionPreference variable. We’ll be using the Stop-Process Cmdlet to test this. PS C:\> $ErrorActionPreference Continue PS C:\> Stop-Process 206,304 Stop-Process : Cannot find a process with the process identifier 206. At line:1 char:13 + Stop-Process <<<< 206,304 Stop-Process : Cannot find a process with the process identifier 304.