Powershell named parameters

I need to use invoke-command to execute a PowerShell script as a job and to pass a list of values. I found several samples in forums and blogs but none works for me. My code should look like:.

powershell named parameters

The script should run with PowerShell 4 but working with PowerShell 2 whould be a plus. Can anybody provide an hint? Regards marius. Hi Marius, Use get-help to look at the usage for invoke-command. You will see there are 3 different parameter sets that use the parameters you have specified in your example. As a result Powershell cannot determine which parameter set to use. You should be getting an error indicating this.

Many thanks. Let me ask for some further details: — I see the use of [-ArgumentList ]: given I need to pass 3 parameters like in my sample cose, what is the right way to specify them? Invoke-Command is usually used if you want to run something on a remote machine. If you just want to run something in the background on the local machine, you might want to look into Start-Job or using RunSpaces.

This topic has 4 replies, 3 voices, and was last updated 2 years, 11 months ago by. Curtis Smith. April 20, at pm Topics: Replies: Topics: 6. Invoke-Command : Parameter set cannot be resolved using the specified named parameters.

About Parameters

April 21, at am Aleksandras Artemjevas. Topics: 1.

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April 25, at pm Sign in to your account Account Login Username. Sign in. Forgot your password?In unnamed parameters method, you cannot have more control with inputs and powershel script itself look unclear to understand the process. To overcome this, you can pass arguments by named parameter. To get arguments by name, we need to use param statement. You can set an argument as Mandatory parameter to force user to enter the specific argument to run script. You can force user to enter input values dynamically from inside part of Powershell script using Read-Host cmdlet with respect to your dynamic need.

You can force user to enter password from inside part of Powershell script using Read-Host cmdlet, and you can mask the password string by setting a parameter -asSecureString in Read-Host cmdlet.

Save my name, email, and website in this browser for the next time I comment. In this article, I am going to explain about how to pass arguments into Powershell script and how to get input values dynamically from Powershell script. You can pass parameters in different ways either by unnamed parameters, named parameters and you can even force the user to enter specific parameter value.

Pass arguments by named parameters In unnamed parameters method, you cannot have more control with inputs and powershel script itself look unclear to understand the process. Ask dynamic arguments within Powershell script You can force user to enter input values dynamically from inside part of Powershell script using Read-Host cmdlet with respect to your dynamic need.

Ask password from user in Powershell script You can force user to enter password from inside part of Powershell script using Read-Host cmdlet, and you can mask the password string by setting a parameter -asSecureString in Read-Host cmdlet. Run PowerShell script from Task Scheduler. Read Registry Value by Powershell Script. Set Environment Variable using Powershell Script.A PowerShell function can have different parameters depending on how it is called.

This is called Parameter Sets. For example, Get-Process has a non mandatory parameter called Name which specifies which processes to Get by Name. But is also has a parameter called ID which also specifies which processes to get, this time by ID. Both parameters exists but are mutually exclusive, you cannot use them both at the same time, since they are defined in two different Parameter Sets. The function itself will write only the name of the current set to the pipeline.

There are a few ways to investigate a command and see which parameter sets that are available. This easiest way is to call Get-Command with the parameter —Syntax like this:.

This shows each parameter set that can be used.

Regular Expression Named and Multiple Captures with PowerShell

The first set has one non-mandatory named parameter, Name and the second one has one non-mandatory named parameter, ID. All is good as long as one of the parameters is specified but if we try to run the command either without specifying any parameter we will get an error stating:. There are two ways to get around this. Either we can set one, and only one of the Parameters to mandatory. If Name is mandatory and the function is called without parameters, PowerShell will assume that the set is ID since that is the only set without any mandatory parameters.

BUT there is a better way! By setting one parameter set as default, PowerShell will know which one to use if more than one matches.

This is done by simply adding this:.

PowerShell Function: Syntax, Parameters, Examples

All right, so far things are fairly straight forward. What if I want one parameter to be a member of more than one set? If I on the other hand run Test-MultiParamSets using the parameter ID, I will not be prompted for a name since it is not mandatory in this parameter set.

To make it more clear which parameter has which value, the function now also prints the value of each parameter. Here is when things get a little bit messy.

Get-Command still shows the parameter Name as being named and not Positional!

Powershell Best Practice #2: Use named parameter in scripts (not positional and partial parameter)

To see this we can use the object returned from Get-Command. It has a property called Parameters, which is a hashtable with one key for each parameter.

If we look only on the parameters Name and ID the function also has a bunch of common parameters :. This shows that the parameter Name is part of three parameter sets, even though only two is shown by Get-Command —Syntax. Name shows up as a named parameter for both sets in the picture above.Has there ever been a time when you wanted to call a function or cmdlet with specific parameters that were based on conditional criteria that is provided? As an example: if a user requests your cmdlet, with a specific value supplied for a parameter, it should then require a second parameter.

This goes beyond utilizing ParameterSets. These are conditional parameters, or more properly referred to as dynamic parameters. To help illustrate the concept of dynamic parameters, I will be using the example of an electronic lemonade stand. We will call it ELS for short. The primary function of ELS is to sell lemonade, but it also sells water, tea, and coffee. The only thing it requests by default is the quantity. The above script works in this way.

With the base script ready to go we have a new requirement for our ELS system. The system needs to be able to support a new alcoholic product, Hard Lemonade. If the customer asks for Hard Lemonade as the product, then the ELS system must verify that the customer is 21 years old or older. This leads us into utilizing dynamic parameters. It is important to note that the documentation does point out one word of caution with the use of dynamic parameters.

To create a dynamic parameter, you will need to use the DynamicParam keyword. Dynamic parameters are declared after the Param definition if used in a cmdlet. Before you can use a dynamic parameter you have to do a few things beforehand. Here is a list of the steps that need to be completed before you can use your dynamic parameter. If we want to specify the attributes of a Parameter, we have to specify it before we create the RuntimeDefinedParameter.

This is done with the System. ParameterAttribute object. The ParameterAttribute object is used to represent the attributes of the parameter. You can set the following properties with the ParameterAttribute object:. We use the System. Collection[Type] object for this. We use the. Now that we have our attributes defined for our parameter and we have it in a collection, we can create the RuntimeDefinedParameter object.

The System.

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RuntimeDefinedParameter object is used to add a parameter to the parameter list at runtime.Most PowerShell commands, such as cmdlets, functions, and scripts, rely on parameters to allow users to select options or provide input. The parameters follow the command name and have the following form:. The name of the parameter is preceded by a hyphen -which signals to PowerShell that the word following the hyphen is a parameter name. The parameter name and value can be separated by a space or a colon character.

Some parameters do not require or accept a parameter value. Other parameters require a value, but do not require the parameter name in the command.

The type of parameters and the requirements for those parameters vary. To find information about the parameters of a command, use the Get-Help cmdlet. For example, to find information about the parameters of the Get-ChildItem cmdlet, type:. To find information about the parameters of a script, use the full path to the script file.

For example:.

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The Get-Help cmdlet returns various details about the command, including a description, the command syntax, information about the parameters, and examples showing how to use the parameters in a command. You can also use the Parameter parameter of the Get-Help cmdlet to find information about a particular parameter. For example, the following command gets information about all parameters of the Get-Member cmdlet:.

Optional parameters have a default value, which is the value that is used or assumed when the parameter is not specified in the command. For example, the default value of the ComputerName parameter of many cmdlets is the name of the local computer. As a result, the local computer name is used in the command unless the ComputerName parameter is specified.

To find the default parameter value, see help topic for the cmdlet. The parameter description should include the default value. You can also set a custom default value for any parameter of a cmdlet or advanced function.

powershell named parameters

When you use the FullParameteror Online parameters of the Get-Help cmdlet, Get-Help displays a parameter attribute table with detailed information about the parameter. This information includes the details you need to know to use the parameter. For example, the help topic for the Get-ChildItem cmdlet includes the following details about its Path parameter:.

The parameter information includes the parameter syntax, a description of the parameter, and the parameter attributes. The following sections describe the parameter attributes. This setting indicates whether the parameter is mandatory, that is, whether all commands that use this cmdlet must include this parameter. When the value is True and the parameter is missing from the command, PowerShell prompts you for a value for the parameter. If the Position setting is set to a positive integer, the parameter name is not required.

This type of parameter is referred to as a positional parameter, and the number indicates the position in which the parameter must appear in relation to other positional parameters. A named parameter can be listed in any position after the cmdlet name. If you include the parameter name for a positional parameter, the parameter can be listed in any position after the cmdlet name. The Position setting for Path is 0which means that it is a positional parameter.

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The Position setting for Exclude is named. This means that Path does not require the parameter name, but its parameter value must be the first or only unnamed parameter value in the command. However, because the Exclude parameter is a named parameter, you can place it in any position in the command.

As a result of the Position settings for these two parameters, you can use any of the following commands:. If you were to include another positional parameter without including the parameter name, that parameter must be placed in the order specified by the Position setting.In this article, Greg Moore explains how to write a PowerShell script that takes parameters. Recently I had a client ask me to update a script in both production and UAT.

He wanted any emails sent out to include the name of the environment. It was a simple request, and I supplied a simple solution. I just created a new variable:. After updating the script for the production environment, I then modified the subject line for any outgoing emails to include the new variable.

powershell named parameters

At the time though, I wanted to do this in a better way, and not just for this variable, but also for the others I use in the script. When I wrote this script, it was early in my days of writing PowerShell, so I simply hardcoded variables into it.

I will show you how to do it in two different ways and discuss why I prefer one method over the other. The first and arguably see what I did there the easiest way to get command line arguments is to write something like the following:. This is a case where you will need to run the saved file from the ISE Console and supply a value for the argument.

To make sure PowerShell executes what you want, navigate in the command line to the same directory where you will save your scripts. It will echo back FOO. The scripts for this article can be found here. One nice ability of reading the arguments this way is that you can pass in an arbitrary number of arguments if you need to. For one thing, you can accidentally pass in parameters in the wrong order.

I will outline the preferred method below. This is what you might expect, but say you had multiple parameters and wanted to make sure you had assigned the right value to each one. You might have trouble remembering their names and perhaps their order. Type in the same command as above but add a dash - at the end.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. In the below script either the -live or -test parameters should be required. However, the script will run without either switch. If I use one of those parameters I get the below error. Why is it not requiring either -live or -test and why is it failing if I use one of them? I think you have confused yourself about parameter sets.

What you have done is created five distinct parameter sets, and only one of those five can be active at any time. If I read your intent correctly, what you need is the ability to do any of the following:. If that is the case, you need six different parameter groups, not five. Each of your parameters should be a member of the groups it is needed in, so something like this:.

About Parameters

See this Microsoft article for more information about Parameter Sets. Learn more. Parameter set cannot be resolved using the specified named parameters Ask Question.

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Asked 1 month ago. Active 1 month ago. Viewed times. Comment Next Variable. Jessen Feb 19 at I think you have mistakenly assumed that you have two groups of parameter sets because you grouped them separately.

In actuality, you have 5 distinct parameter sets, and only one of the 5 can be active at any time. See my answer below. Active Oldest Votes. I hope this helps.

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