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    <h2>Use on existing cmdlets</h2> <p>Explicitly supply the -WhatIf parameter:</p> <pre><code>rm foo.txt -WhatIf </code></pre> <p>Result:</p> <pre><code>What if: Performing operation "Remove File" on Target "C:\temp\foo.txt". </code></pre> <h2>Use on existing cmdlets within a function or script</h2> <p><code>SupportsShouldProcess</code> attribute automatically propagates <code>-WhatIf</code> to supported cmdlets:</p> <pre><code>function do-stuff { [CmdletBinding(SupportsShouldProcess=$True)] param([string]$file) Remove-Item $file } do-stuff foo.txt -WhatIf </code></pre> <p>Result:</p> <pre><code>What if: Performing operation "Remove File" on Target "C:\temp\foo.txt". </code></pre> <h2>Use on your own code blocks</h2> <p>Explicitly use <code>ShouldProcess()</code> method to determine whether <code>-WhatIf</code> was passed:</p> <pre><code>function do-stuff { [CmdletBinding(SupportsShouldProcess=$True)] param([string]$file) if ($PSCmdlet.ShouldProcess($file)) { Write-Host "Deleting file" Remove-Item $file } } do-stuff foo.txt -WhatIf </code></pre> <p>Result:</p> <pre><code>What if: Performing operation "do-stuff" on Target "foo.txt". </code></pre> <h2>Use on Nested functions in the <em>same</em> module</h2> <p><code>SupportsShouldProcess</code> attribute automatically propagates <code>-WhatIf</code> to nested functions:</p> <pre><code>function do-stuff { [CmdletBinding(SupportsShouldProcess=$True)] param([string]$file) if ($PSCmdlet.ShouldProcess($file)) { Write-Host "Deleting file" Remove-Item $file } inner "text" } function inner { [CmdletBinding(SupportsShouldProcess=$True)] param([string]$s) if ($PSCmdlet.ShouldProcess($s)) { Write-Host "Inner task" } $s | out-file "temp9.txt" } do-stuff foo.txt -WhatIf </code></pre> <p>Result:</p> <pre><code>What if: Performing operation "do-stuff" on Target "foo.txt". What if: Performing operation "inner" on Target "text". What if: Performing operation "Output to File" on Target "temp9.txt". </code></pre> <h2>Use on Nested functions in a <em>different</em> module</h2> <p>Unfortunately, -WhatIf does not propagate automatically to functions defined in a different module. See <a href="https://stackoverflow.com/questions/7984876/powershell-how-to-get-whatif-to-propagate-to-cmdlets-in-another-module">Powershell: How to get -whatif to propagate to cmdlets in another module</a> for discussion and workaround for this.</p>
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