[function] Create a function with optional call variables

Is there a way to create a parameter in a PowerShell function where you have to call it in order to have it considered?

An example given by commandlet (the bold being what I want to do):

Invoke-Command -computername Server01 -Scriptblock {...}

Here is an example of what I want to do with the function

Function DoStuff($computername, -arg2, -domain $domain)
    Test-parameter(-domain) if (-domain -eq $true) {
        use $domain
    }
    Else {
        $domain = "Domain1"
    }
    test-parameter($arg2) {
        if ($arg2 -eq $true) {
            Do something
        }
        else {
            Do the opposite
        }
    }

So in summary:

If "-arg2" is present, I want something to happen in the script. If "-Domain" is present and has an argument with it, I want that to be used rather then the set argument.

This question is related to function powershell windows-7 parameters

The answer is


Not sure I understand the question correctly.

From what I gather, you want to be able to assign a value to Domain if it is null and also what to check if $args2 is supplied and according to the value, execute a certain code?

I changed the code to reassemble the assumptions made above.

Function DoStuff($computername, $arg2, $domain)
{
    if($domain -ne $null)
    {
        $domain = "Domain1"
    }

    if($arg2 -eq $null)
    {
    }
    else
    {
    }
}

DoStuff -computername "Test" -arg2 "" -domain "Domain2"
DoStuff -computername "Test" -arg2 "Test"  -domain ""
DoStuff -computername "Test" -domain "Domain2"
DoStuff -computername "Test" -arg2 "Domain2"

Did that help?


I don't think your question is very clear, this code assumes that if you're going to include the -domain parameter, it's always 'named' (i.e. dostuff computername arg2 -domain domain); this also makes the computername parameter mandatory.

Function DoStuff(){
    param(
        [Parameter(Mandatory=$true)][string]$computername,
        [Parameter(Mandatory=$false)][string]$arg2,
        [Parameter(Mandatory=$false)][string]$domain
    )
    if(!($domain)){
        $domain = 'domain1'
    }
    write-host $domain
    if($arg2){
        write-host "arg2 present... executing script block"
    }
    else{
        write-host "arg2 missing... exiting or whatever"
    }
}

Examples related to function

$http.get(...).success is not a function Function to calculate R2 (R-squared) in R How to Call a Function inside a Render in React/Jsx How does Python return multiple values from a function? Default optional parameter in Swift function How to have multiple conditions for one if statement in python Uncaught TypeError: .indexOf is not a function Proper use of const for defining functions in JavaScript Run php function on button click includes() not working in all browsers

Examples related to powershell

Why powershell does not run Angular commands? How do I install the Nuget provider for PowerShell on a unconnected machine so I can install a nuget package from the PS command line? How to print environment variables to the console in PowerShell? Check if a string is not NULL or EMPTY The term 'ng' is not recognized as the name of a cmdlet VSCode Change Default Terminal 'Connect-MsolService' is not recognized as the name of a cmdlet Powershell Invoke-WebRequest Fails with SSL/TLS Secure Channel Install-Module : The term 'Install-Module' is not recognized as the name of a cmdlet Change directory in PowerShell

Examples related to windows-7

ng is not recognized as an internal or external command Why am I getting ImportError: No module named pip ' right after installing pip? How to Delete node_modules - Deep Nested Folder in Windows Telnet is not recognized as internal or external command Multiple -and -or in PowerShell Where-Object statement How do I set ANDROID_SDK_HOME environment variable? Run Batch File On Start-up Why isn't .ico file defined when setting window's icon? How to access shared folder without giving username and password Can't start hostednetwork

Examples related to parameters

Stored procedure with default parameters AngularJS ui router passing data between states without URL C#: HttpClient with POST parameters HTTP Request in Swift with POST method In Swift how to call method with parameters on GCD main thread? How to pass parameters to maven build using pom.xml? Default Values to Stored Procedure in Oracle How do you run a .exe with parameters using vba's shell()? How to set table name in dynamic SQL query? How to pass parameters or arguments into a gradle task