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powershell / Invoke-CmdScript.ps1

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############################################################################## 
##  
## Invoke-CmdScript.ps1  
##  
## Invoke the specified batch file (and parameters), but also propigate any 
## environment variable changes back to the PowerShell environment that 
## called it.  
## http://www.leeholmes.com/blog/2006/05/11/nothing-solves-everything-%E2%80%93-powershell-and-other-technologies/
##  
## ie:  
##  
## PS > type foo-that-sets-the-FOO-env-variable.cmd  
## @set FOO=%*  
## echo FOO set to %FOO%.  
##   
## PS > $env:FOO  
##   
## PS > Invoke-CmdScript ”foo-that-sets-the-FOO-env-variable.cmd” Test 
##   
## C:\Temp>echo FOO set to Test.  
## FOO set to Test.  
##   
## PS > $env:FOO  
## Test  
##  
############################################################################## 

param([string] $script, [string] $parameters)  

$tempFile = [IO.Path]::GetTempFileName()  

## Store the output of cmd.exe.  We also ask cmd.exe to output  
## the environment table after the batch file completes  

cmd /c " `"$script`" $parameters && set > `"$tempFile`" " 

## Go through the environment variables in the temp file.  
## For each of them, set the variable in our local environment. 
Get-Content $tempFile | Foreach-Object {   
    if($_ -match "^(.*?)=(.*)$")  
    { 
        Set-Content "env:\$($matches[1])" $matches[2]  
    } 
}  

Remove-Item $tempFile