Powershell How can I stop errors from being displayed in a script

Question

When my PowerShell script tries  for example  to create a SQL Server object for a server that doesn t exist   bla  in my case   PowerShell displays lots of PowerShell errors in red   Since my script checks the value of    after such calls  and displays and logs errors  I d rather not have the several lines of PowerShell errors displayed as well   How can I deactivate those being displayed for my script

User · Answer

Windows PowerShell provides two mechanisms for reporting errors: one mechanism for terminating errors and another mechanism for non-terminating errors.

Internal CmdLets code can call a ThrowTerminatingError method when an error occurs that does not or should not allow the cmdlet to continue to process its input objects. The script writter can them use exception to catch these error.

EX :

try
{
  Your database code
}
catch
{
  Error reporting/logging
}

Internal CmdLets code can call a WriteError method to report non-terminating errors when the cmdlet can continue processing the input objects. The script writer can then use -ErrorAction option to hide the messages, or use the $ErrorActionPreference to setup the entire script behaviour.

User · Answer

I had a similar problem when trying to resolve host names using  system net dns   If the IP wasn t resolved  Net threw a terminating error  To prevent the terminating error and still retain control of the output  I created a function using TRAP   E G   Function Get-IP   PARAM     string  HostName     PROCESS  TRAP                    continue                 system net dns   gethostaddresses  HostName

User · Answer

In some cases you can pipe after the command a Out-Null  command   Out-Null

User · Answer

Add -ErrorAction SilentlyContinue to your script and you ll be good to go

User · Answer

If you want the powershell errormessage for a cmdlet suppressed  but still want to catch the error  use  -erroraction  silentlyStop

User · Answer

You re way off track here   You already have a nice  big error message  Why on Earth would you want to write code that checks    explicitly after every single command  This is enormously cumbersome and error prone  The correct solution is stop checking      Instead  use PowerShell s built in mechanism to blow up for you  You enable it by setting the error preference to the highest level    ErrorActionPreference    Stop    I put this at the top of every single script I ever write  and now I don t have to check     This makes my code vastly simpler and more reliable   If you run into situations where you really need to disable this behavior  you can either catch the error or pass a setting to a particular function using the common -ErrorAction  In your case  you probably want your process to stop on the first error  catch the error  and then log it   Do note that this doesn t handle the case when external executables fail  exit code nonzero  conventionally   so you do still need to check  LASTEXITCODE if you invoke any  Despite this limitation  the setting still saves a lot of code and effort   Additional reliability  You might also want to consider using strict mode   Set-StrictMode -Version Latest   This prevents PowerShell from silently proceeding when you use a non-existent variable and in other weird situations   See the -Version parameter for details about what it restricts    Combining these two settings makes PowerShell much more of fail-fast language  which makes programming in it vastly easier

User · Answer

You have a couple of options   The easiest involve using the ErrorAction settings   -Erroraction is a universal parameter for all cmdlets   If there are special commands you want to ignore you can use -erroraction  silentlycontinue  which will basically ignore all error messages generated by that command  You can also use the Ignore value  in PowerShell 3        Unlike SilentlyContinue  Ignore does not add the error message to the  Error automatic variable    If you want to ignore all errors in a script  you can use the system variable  ErrorActionPreference and do the same thing   ErrorActionPreference   silentlycontinue   See about CommonParameters for more info about -ErrorAction  See about preference variables for more info about  ErrorActionPreference

[powershell] Powershell: How can I stop errors from being displayed in a script?

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