Add-Path Cmdlet

Add-Path.ps1

function Add-Path {
        <#
        .SYNOPSIS
                Adds a Directory to the Current Path
        .DESCRIPTION
                Add a directory to the current path.  This is useful for temporary
                changes to the path or, when run from your profile, for adjusting
                the path within your powershell prompt.
        .EXAMPLE
                Add-Path -Directory "C:\Program Files\Notepad++"
        .PARAMETER Directory
                The name of the directory to add to the current path.
        #>

        [CmdletBinding()]
        param (
                [Parameter(
                        Mandatory=$True,
                        ValueFromPipeline=$True,
                        ValueFromPipelineByPropertyName=$True,
                        HelpMessage='What directory would you like to add?')]
                [Alias('dir')]
                [string[]]$Directory
        )

        PROCESS {
                $Path = $env:PATH.Split(';')

                foreach ($dir in $Directory) {
                        if ($Path -contains $dir) {
                                Write-Verbose "$dir is already present in PATH"
                        } else {
                                if (-not (Test-Path $dir)) {
                                        Write-Verbose "$dir does not exist in the filesystem"
                                } else {
                                        $Path += $dir
                                }
                        }
                }

                $env:PATH = [String]::Join(';', $Path)
        }
}