Scripts (with CmdletBinding) and cmdlets all have a standard -ErrorAction parameter available when being invoked. Is there a way then, within your script, if indeed you script was invoked with -ErrorAction?
Reason I ask is because I want to know if the automatic variable value for $ErrorActionPreference, as far as your script is concerned, was set by -ErrorAction or if it is coming from your session level.
$ErrorActionPreference is a variable in the global(session) scope. If you run a script and don't specify the -ErrorAction parameter, it inherits the value from the global scope ($global:ErrorActionPreference).
If you specify -ErrorAction parameter, the $ErrorActionPreference is changed for your private scope, meaning it's stays the same through the script except while running code where you specified something else(ex. you call another script with another -ErrorAction value). Example to test:
Test.ps1
[CmdletBinding()]
param()
Write-Host "Session: $($global:ErrorActionPreference)"
Write-Host "Script: $($ErrorActionPreference)"
Output:
PS-ADMIN > $ErrorActionPreference
Continue
PS-ADMIN > .\Test.ps1
Session: Continue
Script: Continue
PS-ADMIN > .\Test.ps1 -ErrorAction Ignore
Session: Continue
Script: Ignore
PS-ADMIN > $ErrorActionPreference
Continue
If you wanna test if the script was called with the -ErrorAction paramter, you could use ex.
if ($global:ErrorActionPreference -ne $ErrorActionPreference) { Write-Host "changed" }
If you don't know what scopes is, type this in a powershell console: Get-Help about_scopes
Check the $MyInvocation.BoundParameters object. You could use the built-in $PSBoundParameters variable but I found that in some instances it was empty (not directly related to this question), so imo it's safer to use $MyInvocation.
function Test-ErrorAction
{
param()
if($MyInvocation.BoundParameters.ContainsKey('ErrorAction'))
{
'The ErrorAction parameter has been specified'
}
else
{
'The ErrorAction parameter was not specified'
}
}
Test-ErrorAction
If you need to know if the cmdlet was called with the -ErrorAction parameter do like this:
[CmdletBinding()]
param()
if ($myinvocation.Line.ToLower() -match "-erroraction" )
{
"yessss"
}
else
{
"nooooo"
}
This is true alse when the parameter have same value as the global $ErrorActionPreference
