Powershell – Write-Verbose ignored in PowerShell module

powershellpowershell-2.0

I'm hoping to use the Write-Verbose commandlet in scripts and functions. It works as expected in script (.ps1) files, but not in module (.psm1) files–the commandlet is ignored in modules.

Running the following script:

PS> .\scaffold.ps1 -verbose

Produces:

VERBOSE: starting foo
path: c:\bar.txt
[missing entry here - 'verbose path: c:\bar.txt']
VERBOSE: ending foo

scaffold.ps1:

[cmdletbinding()]
param()

import-module Common -force

write-verbose "starting foo"

foo "c:\bar.txt"

write-verbose "ending foo"

Common.psm1:

function foo {

  [cmdletbinding()]
  Param(
    [string]$path
  )

  write-host "path: $path"
  write-verbose "verbose path: $path"

}

I haven't associated a manifest (.psd1) with the module (.psm1) at this point.

Is there a module-specific syntax that I need to use?

** edit **

What I need is a way to determine if the -verbose flag has been set on the .PS1 file so I can pass it to the .PSM1 file.

scaffold.ps1:

[cmdletbinding()]
param()

import-module Common -force

write-verbose "starting foo"

foo "c:\bar.txt" $verbose_flag # pass verbose setting to module based on what was set on the script itself

write-verbose "ending foo"

Best Answer

To get Write-Verbose output from a cmdlet in a module, you need to use the -verbose common parameter. See http://technet.microsoft.com/en-us/magazine/ff677563.aspx

Using your code:

>import-module R:\Common.psm1
>foo "c:\users"
path: c:\users
>foo "c:\users" -verbose
path: c:\users
VERBOSE: verbose path: c:\users
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