February 2019
Intermediate to advanced
626 pages
15h 51m
English
Content preview from Mastering Windows PowerShell Scripting - Third Edition
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ConfirmPreference
If the Confirm parameter is not set, whether or not a prompt is shown is determined by PowerShell. The value of the ConfirmPreference variable is compared with the stated impact of a command.
By default, the value of ConfirmPreference is High, as shown in the following code:
PS> $ConfirmPreferenceHigh
By default, commands have a medium impact.
Finding ConfirmImpact
In scripts and functions, the ConfirmImpact setting is part of the CmdletBinding attribute: [CmdletBinding(ConfirmImpact = 'High')].
If CmdletBinding or ConfirmImpact are not present, the impact is medium.
The impact of a function or cmdlet may be viewed using the ConfirmImpact property of a command's metadata:
New-Object System.Management.Automation.CommandMetadata(Get-Command ...
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