Powershell Call-Operator(&) with Parameters from Variable

Question

G'day everyone,

I'm trying to execute a function in PowerShell with the Parameters coming from a Variable I'm not sure if it's possible in the way I want it to but maybe someone has any idea how I would go about doing that.

$scriptPath = "C:\temp\Create-File.ps1"
$parameters = "-Path C:\temp\testfile.txt -DoSomethingSpecial"

& $scriptPath $parameters

Something along those lines, I don't know in which order the Parameters get entered so I can't use $args[n..m] or binding by position for that. Maybe there is some other Cmdlet I don't know about that is capable of doing that?

Yes that would work with some string Manipulation - how would I go about passing that in? — Fabian Fulde
– Fabian Fulde, Commented Oct 1, 2018 at 8:37

Tomer W · Accepted Answer · 2019-04-06 10:29:02Z

9

Passing an Object as @James C. suggested in his answer allows only to pass parameters in Powershell syntax (e.g. -param1 value1 -param2 value2)

When you need more control over the parameters you pass such as:

double dash syntax for unix style --param1 value1
Slash syntax for Windows style /param1 value1
Equals sign required (or colon) -param1=value1 or -param1:value1
No value for parameter -boolean_param1
additional verbs (values without a param name) value1 value2

you can use an array instead of an object

take ipconfig command for example to renew all connections with "con" in their name:

$cmd = "ipconfig"
$params = @('/renew', '*Con*');
& $cmd $params

or the specific question given example:

$params = @('-Path', 'C:\temp\testfile.txt', '-DoSomethingSpecial')
.\Create-File.ps1 @params

answered Apr 6, 2019 at 10:29

Tomer W

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henrycarteruk · Accepted Answer · 2019-04-04 10:14:35Z

4

You can use a hastable and Splatting to do this.

Simply set each param name and value in the variable as you would a normal hastable, then pass this in using @params syntax.

The switch param however, needs a $true value for it to function correctly.

$params = @{
    Path               = 'C:\temp\testfile.txt'
    DoSomethingSpecial = $true
}

.\Create-File.ps1 @params

edited Apr 4, 2019 at 10:14

answered Oct 1, 2018 at 8:51

henrycarteruk

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4 Comments

Fabian Fulde Over a year ago

That worked like a charm - I didnt even know this existed. Thank you!

Tomer W Over a year ago

how would i pass a Verb ? e.g myfile.exe -named_param named_value verb1 verb2

henrycarteruk Over a year ago

@TomerW Just quote the entire thing: @{ named_param = "named_value verb1 verb2" }

Tomer W Over a year ago

@JamesC. That pases -named_param "named_value verb1 verb2"... BUT I found that using Array instead of Object as @("-named_param", "named_value","verb1","verb2") works well and is more versatile for different conventions of param syntax.

Milad · Accepted Answer · 2018-10-01 08:46:07Z

2

You can run it by Start-Process

Start-Process powershell -ArgumentList "$scriptPath $parameters"

answered Oct 1, 2018 at 8:46

Milad

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Comments

Norbert Nemec · Accepted Answer · 2023-07-17 13:24:25Z

0

Simple solution with minimal change to the original:

$scriptPath = "C:\temp\Create-File.ps1"
$parameters = "-Path C:\temp\testfile.txt -DoSomethingSpecial"

& $scriptPath $parameters.Split()

answered Jul 17, 2023 at 13:24

Norbert Nemec

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