PowerShell Add-Path function

add-path.ps1

# Based on:
#  http://blogs.technet.com/b/heyscriptingguy/archive/2011/07/23/use-powershell-to-modify-your-environmental-path.aspx
# Based on:
#  http://blogs.technet.com/b/heyscriptingguy/archive/2011/07/23/use-powershell-to-modify-your-environmental-path.aspx
function Add-Path{
    [cmdletbinding()]
    param(
        [Parameter(Mandatory=$True,ValueFromPipeline=$True,Position=0)]
        [string[]]$pathToAdd
    )
    process{
        # Get the current search path from the environment keys in the registry.
        $oldpath=$env:path
        if (!$pathToAdd){
            ‘No Folder Supplied. $env:path Unchanged’ | Write-Verbose
        }
        elseif (!(test-path $pathToAdd)){
            ‘Folder [{0}] does not exist, Cannot be added to $env:path’ -f $pathToAdd | Write-Verbose
        }
        elseif ($env:path | Select-String -SimpleMatch $pathToAdd){
            'Folder already within $env:path' | Write-Verbose
        }
        else{
            'Adding [{0}] to the path' -f $pathToAdd | Write-Verbose
            $newpath = $oldpath
            # set the new path
            foreach($path in $pathToAdd){
                $newPath += ";$path"
            }

            $env:path = $newPath
            [Environment]::SetEnvironmentVariable('path',$newPath,[EnvironmentVariableTarget]::Process) | Out-Null
        }
    }
}