Public/Add-PSModulePath.ps1
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function Add-PSModulePath { <# .SYNOPSIS Adds a directory path to the PowerShell global environment variable. .DESCRIPTION This function adds the specified directory path to the PowerShell global environment variable on the computer. .EXAMPLE PS C:\PS> Add-PSModulePath -DirectoryPath "D:\PowerShell Modules" Description ----------- This adds the 'D:\PowerShell Modules' directory path to the PowerShell global environment variable. .PARAMETER DirectoryPath Specifies a path to a location. .INPUTS System.String You can pipe a file system path (in quotation marks) to this function. .OUTPUTS System.String #> [CmdLetBinding()] param ( # Directory path [Parameter(Mandatory, ValueFromPipeline)] [ValidateNotNullOrEmpty()] [ValidateScript( # Directory path validation { Test-Path -Path $PSItem -PathType Container }, ErrorMessage = "'{0}' does not exist." )] [Alias("Directory", "DirectoryPath")] [string] $Path ) begin { # Error handling Set-StrictMode -Version "Latest" Get-CallerPreference -Cmdlet $PSCmdlet -SessionState $ExecutionContext.SessionState $CallerEA = $ErrorActionPreference $ErrorActionPreference = "Stop" } process { try { if (($Path.ToCharArray() | Select-Object -Last 1) -eq "\") { # Trailing backslash removed from path entered Write-Debug -Message "Removing trailing backslash from '$Path'" Write-Verbose -Message "Removing trailing backslash from path entered" $Path = $Path.TrimEnd("\") } if ($env:PSModulePath -split ";" -contains $Path) { # Path already exists Write-Host -Object "'$Path' already exists." break } # Path update Write-Debug -Message "Appending '$Path' to '$env:PSModulePath'" Write-Verbose -Message "Updating environmental PowerShell module path variable" $NewPSModPath = $env:PSModulePath += ";$Path" [System.Environment]::SetEnvironmentVariable("PSModulePath", $NewPSModPath, "Machine") # New path output Write-Debug -Message "Outputting '`$env:PSModulePath' as a string" Write-Verbose -Message "Outputting new module path" Write-Output -InputObject $env:PSModulePath } catch { Write-Error -ErrorRecord $PSItem -ErrorAction $CallerEA } } } |