The following Powershell script works very well for this:
Remove-PathFolders -Folders "*\Java\jdk*" -EnvironmentVariableTarget $([System.EnvironmentVariableTarget]::Machine) $jdkDp = (Get-ChildItem -Path "C:\Program Files (x86)\Java\jdk*" | Sort-Object name | Select-Object -Last 1).FullName Add-PathFolders -Folders $($jdkDp + "\bin\") -EnvironmentVariableTarget $([System.EnvironmentVariableTarget]::Machine) Get-PathFolders -EnvironmentVariableTarget $([System.EnvironmentVariableTarget]::Machine)
Which use the following custom functions inspired from here (you can include everything in the same UpdateJavaPath.ps1 script):
<# .SYNOPSIS Gets the list of folders specified in the Path environment variable. .PARAMETER EnvironmentVariableTarget Specifies the "scope" to use when querying the Path environment variable ("Process", "Machine", or "User"). Defaults to "Process" if the parameter is not specified. .EXAMPLE .\Get-PathFolders.ps1 C:\Windows\system32\WindowsPowerShell\v1.0\ C:\Windows\system32 C:\Windows C:\Windows\System32\Wbem ... Description ----------- The output from this example lists each folder in the Path environment variable for the current process. .EXAMPLE .\Get-PathFolders.ps1 User C:\NotBackedUp\Public\Toolbox Description ----------- The output from this example assumes one folder ("C:\NotBackedUp\Public\Toolbox") has previously been added to the user's Path environment variable. #> Function Get-PathFolders() { param( [string] $EnvironmentVariableTarget = "Process") Set-StrictMode -Version Latest $ErrorActionPreference = "Stop" [string[]] $pathFolders = [Environment]::GetEnvironmentVariable( "Path", $EnvironmentVariableTarget) -Split ";" If ($pathFolders -ne $null) { Write-Output $pathFolders } } <# .SYNOPSIS Adds one or more folders to the Path environment variable. .PARAMETER Folders Specifies the folders to add to the Path environment variable.. .PARAMETER EnvironmentVariableTarget Specifies the "scope" to use for the Path environment variable ("Process", "Machine", or "User"). Defaults to "Process" if the parameter is not specified. .EXAMPLE .\Add-PathFolders.ps1 C:\NotBackedUp\Public\Toolbox #> Function Add-PathFolders() { param( [parameter(Mandatory = $true, ValueFromPipeline = $true)] [string[]] $Folders, [string] $EnvironmentVariableTarget = "Process") begin { Set-StrictMode -Version Latest $ErrorActionPreference = "Stop" Write-Verbose "Path environment variable target: $EnvironmentVariableTarget" [bool] $isInputFromPipeline = ($PSBoundParameters.ContainsKey("Folders") -eq $false) [int] $foldersAdded = 0 [string[]] $pathFolders = [Environment]::GetEnvironmentVariable( "Path", $EnvironmentVariableTarget) -Split ";" [Collections.ArrayList] $folderList = New-Object Collections.ArrayList $pathFolders | foreach { $folderList.Add($_) | Out-Null } } process { If ($isInputFromPipeline -eq $true) { $items = $_ } Else { $items = $Folders } $items | foreach { [string] $folder = $_ [bool] $isFolderInList = $false $folderList | foreach { If ([string]::Compare($_, $folder, $true) -eq 0) { Write-Verbose ("The folder ($folder) is already included" ` + " in the Path environment variable.") $isFolderInList = $true return } } If ($isFolderInList -eq $false) { Write-Verbose ("Adding folder ($folder) to Path environment" ` + " variable...") $folderList.Add($folder) | Out-Null $foldersAdded++ } } } end { If ($foldersAdded -eq 0) { Write-Verbose ("No changes to the Path environment variable are" ` + " necessary.") return } [string] $delimitedFolders = $folderList -Join ";" [Environment]::SetEnvironmentVariable( "Path", $delimitedFolders, $EnvironmentVariableTarget) Write-Verbose ("Successfully added $foldersAdded folder(s) to Path" ` + " environment variable.") } } <# .SYNOPSIS Removes one or more folders from the Path environment variable. .PARAMETER Folders Specifies the folders to remove from the Path environment variable.. .PARAMETER EnvironmentVariableTarget Specifies the "scope" to use for the Path environment variable ("Process", "Machine", or "User"). Defaults to "Process" if the parameter is not specified. .EXAMPLE .\Remove-PathFolders.ps1 C:\NotBackedUp\Public\Toolbox #> Function Remove-PathFolders(){ param( [parameter(Mandatory = $true, ValueFromPipeline = $true)] [string[]] $Folders, [string] $EnvironmentVariableTarget = "Process") begin { Set-StrictMode -Version Latest $ErrorActionPreference = "Stop" Write-Verbose "Path environment variable target: $EnvironmentVariableTarget" [bool] $isInputFromPipeline = ($PSBoundParameters.ContainsKey("Folders") -eq $false) [int] $foldersRemoved = 0 [string[]] $pathFolders = [Environment]::GetEnvironmentVariable( "Path", $EnvironmentVariableTarget) -Split ";" [Collections.ArrayList] $folderList = New-Object Collections.ArrayList $pathFolders | foreach { $folderList.Add($_) | Out-Null } } process { If ($isInputFromPipeline -eq $true) { $items = $_ } Else { $items = $Folders } $items | foreach { [string] $folder = $_ [bool] $isFolderInList = $false for ([int] $i = 0; $i -lt $folderList.Count; $i++) { #If ([string]::Compare($folderList[$i], $folder, $true) -eq 0) if (($folderList[$i] -like $folder) -or ($folderList[$i] -eq "")) { $isFolderInList = $true Write-Verbose ("Removing folder ($folderList[$i]) from Path" ` + " environment variable...") $folderList.RemoveAt($i) $i-- $foldersRemoved++ } } If ($isFolderInList -eq $false) { Write-Verbose ("The folder ($folder) is not specified in the Path" ` + " list.") } } } end { If ($foldersRemoved -eq 0) { Write-Verbose ("No changes to the Path environment variable are" ` + " necessary.") return } [string] $delimitedFolders = $folderList -Join ";" [Environment]::SetEnvironmentVariable( "Path", $delimitedFolders, $EnvironmentVariableTarget) Write-Verbose ("Successfully removed $foldersRemoved folder(s) from Path" ` + " environment variable.") } }
