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PowerShell string interpolation syntax

To complement marsze’s helpful answer: ${…} (enclosing the variable name in { and }) is indeed always necessary if a variable name contains special characters, such as spaces, ., or -. Not special are _ and – surprisingly and problematically – ?. Note: : is invariably interpreted as terminating a PowerShell drive reference, in the context of namespace variable notation, irrespective of whether {…} enclosure is used or required (e.g., in $env:USERNAME or ${env:USERNAME}, env refers to the PowerShell drive representing all environment variables). In the context … Read more

Powershell: A positional parameter cannot be found that accepts argument “xxx”

Cmdlets in powershell accept a bunch of arguments. When these arguments are defined you can define a position for each of them. This allows you to call a cmdlet without specifying the parameter name. So for the following cmdlet the path attribute is define with a position of 0 allowing you to skip typing -Path … Read more

How can I pass an argument to a PowerShell script?

Tested as working: Call it with Multiple parameters syntax (comments are optional, but allowed): And some example for advanced parameters, e.g. Mandatory: A default value will not work with a mandatory parameter. You can omit the =$true for advanced parameters of type boolean [Parameter(Mandatory)].

PowerShell and the -contains operator

The -Contains operator doesn’t do substring comparisons and the match must be on a complete string and is used to search collections. From the documentation you linked to: -Contains Description: Containment operator. Tells whether a collection of reference values includes a single test value. In the example you provided you’re working with a collection containing just one string … Read more

Array.Add vs +=

When using the $array.Add()-method, you’re trying to add the element into the existing array. An array is a collection of fixed size, so you will receive an error because it can’t be extended. $array += $element creates a new array with the same elements as old one + the new item, and this new larger array replaces the old … Read more

How do I concatenate strings and variables in PowerShell?

See the Windows PowerShell Language Specification Version 3.0, p34, sub-expressions expansion.

How to upgrade PowerShell version from 2.0 to 3.0

The OS that I am using is Windows 7, and the PowerShell version that is installed here is 2.0. Is it possible for me to upgrade it to version 3.0 or 4.0? Because there are cmdlets that version 2.0 can’t recognize.

Prompt for user input in PowerShell

Read-Host is a simple option for getting string input from a user. To hide passwords you can use: To convert the password to plain text: As for the type returned by $host.UI.Prompt(), if you run the code at the link posted in @Christian’s comment, you can find out the return type by piping it to Get-Member (for example, $results | … Read more

Terminating a script in PowerShell

You should use the exit keyword.

How do I pass multiple parameters into a function in PowerShell?

Parameters in calls to functions in PowerShell (all versions) are space-separated, not comma separated. Also, the parentheses are entirely unneccessary and will cause a parse error in PowerShell 2.0 (or later) if Set-StrictMode -Version 2 or higher is active. Parenthesised arguments are used in .NET methods only.

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