Using Verbose Parameter from the Own Cmdlet

I am working on a exciting  book review from a good friend and one of my thoughts is that , when applicable, we can use the verbose from the own cmdlet .

I always thought that if you pass a –verbose parameter to an advanced function , it is recursive to the other cmdlets inside it. Well, I can be wrong, but my test said that is not what happens .

My point is ,lets say that you have a function to copy files from a path to other. (of course you don’t need a function for this, but just to illustrate)  you don’t need to write-verbose “Copying…..”…You can use the verbose message from the copy-item

   1: function Copy-Files

   2: {

   3:     [CmdletBinding()]

   4:     param( 

   5:         [Parameter(Position=0, Mandatory=$true)] [string] $sourcefolder,

   6:         [Parameter(Position=1, Mandatory=$true)] [string] $destinationfolder

   7:     ) 


   9:     $Verbose = (($PSBoundParameters.ContainsKey('Verbose')) -or ($VerbosePreference -ne 'SilentlyContinue'))


  11:     Get-ChildItem -Path $sourcefolder `

  12:     | foreach     { 

  13:             Copy-Item -Path  $_.fullname `

  14:             -Destination $destinationfolder -Verbose:$verbose

  15:     }

  16: }

You can see that I am testing if the –verbose parameter was passed and if the $verbosepreference variable was change :

   1: $Verbose = (($PSBoundParameters.ContainsKey('Verbose')) -or ($VerbosePreference -ne 'SilentlyContinue'))

Then it is just pass the $verbose variable to the  cmdlet : –Verbose:$verbose

   1: Get-ChildItem -Path $sourcefolder `

   2: | foreach     { 

   3:         Copy-Item -Path  $_.fullname `

   4:         -Destination $destinationfolder -Verbose:$verbose

   5: }

Now it is just to call using verbose :

   1: Copy-Files -sourcefolder c:\Teste\Source -destinationfolder c:\Teste\Destination –verbose



or not using verbose :

   1: Copy-Files -sourcefolder c:\teste\Source -destinationfolder c:\teste\Destination 

or you just can change the $verbosepreference before the calling the function , put  –verbose  in the copy-item, or just use write-verbose and you will not to worry about this code that I did. But I liked to do this and avoiding to change the variable or use write-verbose. Just another approach maybe.

I confess that I DO need to do more test,but so far that is what I figured out


About Laerte Junior

Laerte Junior Laerte Junior is a SQL Server specialist and an active member of WW SQL Server and the Windows PowerShell community. He also is a huge Star Wars fan (yes, he has the Darth Vader´s Helmet with the voice changer). He has a passion for DC comics and living the simple life. "May The Force be with all of us"
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