I have a PowerShell script that has a y/n question asked in the script. I cannot change the script as it is downloaded from a url, but I would like to run it such that my choice is passed to the script and processing continues unattended.
I found this question, which is on a similar topic, but more related to cmdlets (and I tried everything here, but no luck).
Here is the relevant code (say this is in a script test.ps1
)
function Confirm-Choice {
param ( [string]$Message )
$yes = New-Object System.Management.Automation.Host.ChoiceDescription "&Yes", "Yes";
$no = New-Object System.Management.Automation.Host.ChoiceDescription "&No", "No";
$choices = [System.Management.Automation.Host.ChoiceDescription[]]($yes, $no);
$caption = "" # Did not need this before, but now getting odd errors without it.
$answer = $host.ui.PromptForChoice($caption, $message, $choices, 1) # Set to 0 to default to "yes" and 1 to default to "no"
switch ($answer) {
0 {return 'yes'; break} # 0 is position 0, i.e. "yes"
1 {return 'no'; break} # 1 is position 1, i.e. "no"
}
}
$unattended = $false # default condition is to ask user for input
if ($(Confirm-Choice "Prompt all main action steps during setup?`nSelect 'n' to make all actions unattended.") -eq "no") { $unattended = $true }
i.e. Without altering the script, I would like to pass 'n' to this so that it will continue processing. Something like test.ps1 | echo 'n'
(though, as before, this specific syntax does not work unfortunately, and I'm looking for a way to do this).
PromptForChoice
appears to read input directly from the console host, so it can't be supplied with input from stdin
.
You may override the function Confirm-Choice
instead, by defining an alias that points to your own function which always outputs 'n'
. This works because aliases take precedence over functions.
function MyConfirm-Choice {'no'}
New-Alias -Name 'Confirm-Choice' -Value 'MyConfirm-Choice' -Scope Global
.\test.ps1 # Now uses MyConfirm-Choice instead of its own Confirm-Choice
# Remove the alias again
Remove-Item 'alias:\Confirm-Choice'