ScriptBlock

This PowerShell module creates and runs scripts from the input pipeline.

Command summary

New-ScriptBlock [-InputString] <string>

Invoke-ScriptBlock -InputString <string> [-ArgumentList <Object[]>] [-NoNewScope]

Invoke-ScriptBlock -ScriptBlock <scriptblock> [-ArgumentList <Object[]>] [-NoNewScope]

The instantiation cmdlet uses ScriptBlock.Create to create the script.

The invocation cmdlet uses Invoke-Command to run the script.

Example

Pipe a script and invoke with given arguments.

@'
param($Message)
Write-Output -InputObject $Message
'@ | Invoke-ScriptBlock -ArgumentList 'Hello World'

Build

Build in the ScriptBlock subdirectory with

$ dotnet publish --configuration Release

Install by copying the module into a directory on the PSModulePath

Example simulating POSIX shell behaviour for piped scripts

This uses rhubarb-geek-nz.Console to provide POSIX like stdin, stdout and stderr access.

• Script is read from stdin using Read-Console
• It is invoked by Invoke-ScriptBlock.
• Arguments are passed via $MyInvocation
• Output is written through Write-Console to split to stdout and stderr.
• try/catch is used to set LastExitCode on Write-Error

#!/usr/bin/env pwsh

$ErrorActionPreference = [System.Management.Automation.ActionPreference]::Stop

& {
	try
	{
		Read-Console | Invoke-ScriptBlock -ArgumentList $global:MyInvocation.UnboundArguments

		Set-Variable -Name LastExitCode -Scope Global -Value 0
	}
	catch
	{
		Set-Variable -Name LastExitCode -Scope Global -Value 1

		$PSItem
	}
} *>&1 | Write-Console

Exit $LastExitCode