Public/System/Update-Env.ps1
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function Update-Env{ <# .SYNOPSIS Refreshes the current PowerShell session's environment variables from the Windows registry. .DESCRIPTION The Refresh-Env function reloads all environment variables from the Windows registry, including system-wide (`HKLM:\System\CurrentControlSet\Control\Session Manager\Environment`) and user-specific (`HKCU:\Environment`) variables. It also merges the `Path` environment variable from both system and user scopes to ensure newly added directories are available without requiring a new shell session. .PARAMETER None This function does not take any parameters. .EXAMPLE Refresh-Env Refreshes the environment variables in the current PowerShell session, applying any recent changes made via registry modifications or external software installations. .EXAMPLE $env:MY_TEST_VAR = "OldValue" Set-ItemProperty -Path "HKCU:\Environment" -Name "MY_TEST_VAR" -Value "NewValue" -Force Refresh-Env $env:MY_TEST_VAR # Output: "NewValue" # This example demonstrates how a registry change to an environment variable is applied immediately. .OUTPUTS None. The function does not return any values, but it updates the session's environment variables. .NOTES - Requires administrative privileges if modifying system environment variables. - This function does not permanently modify environment variables; it only updates the session. - The function does not handle changes made via `SetX` or `Environment.SetEnvironmentVariable` with the `Machine` scope. Author: Michiel VH Date: February 2025 .LINK https://learn.microsoft.com/en-us/windows-server/administration/windows-commands/setx #> Write-Host "Refreshing environment variables from registry..." -ForegroundColor Cyan # Load System-wide environment variables $systemEnvPath = "HKLM:\System\CurrentControlSet\Control\Session Manager\Environment" $systemEnv = Get-ItemProperty -Path $systemEnvPath foreach ($key in $systemEnv.PSObject.Properties.Name) { if ($key -ne "Path") { [System.Environment]::SetEnvironmentVariable($key, $systemEnv.$key, [System.EnvironmentVariableTarget]::Process) } } # Load User-specific environment variables $userEnvPath = "HKCU:\Environment" $userEnv = Get-ItemProperty -Path $userEnvPath foreach ($key in $userEnv.PSObject.Properties.Name) { if ($key -ne "Path") { [System.Environment]::SetEnvironmentVariable($key, $userEnv.$key, [System.EnvironmentVariableTarget]::Process) } } # Special handling for PATH - merge both System and User $systemPath = $systemEnv.Path -split ";" | Where-Object { $_ -ne "" } $userPath = $userEnv.Path -split ";" | Where-Object { $_ -ne "" } $combinedPath = ($systemPath + $userPath) -join ";" [System.Environment]::SetEnvironmentVariable("Path", $combinedPath, [System.EnvironmentVariableTarget]::Process) Write-Host "Environment variables refreshed successfully!" -ForegroundColor Green } # Debug Version function Update-EnvDebug { Write-Host "Refreshing environment variables from registry..." -ForegroundColor Cyan # Load System-wide environment variables $systemEnvPath = "HKLM:\System\CurrentControlSet\Control\Session Manager\Environment" $systemEnv = Get-ItemProperty -Path $systemEnvPath Write-Host "`n[System Environment Variables]:" -ForegroundColor Yellow foreach ($key in $systemEnv.PSObject.Properties.Name) { if ($key -ne "Path") { [System.Environment]::SetEnvironmentVariable($key, $systemEnv.$key, [System.EnvironmentVariableTarget]::Process) Write-Host "Updated: $key = $($systemEnv.$key)" -ForegroundColor Green } } # Load User-specific environment variables $userEnvPath = "HKCU:\Environment" $userEnv = Get-ItemProperty -Path $userEnvPath Write-Host "`n[User Environment Variables]:" -ForegroundColor Yellow foreach ($key in $userEnv.PSObject.Properties.Name) { if ($key -ne "Path") { [System.Environment]::SetEnvironmentVariable($key, $userEnv.$key, [System.EnvironmentVariableTarget]::Process) Write-Host "Updated: $key = $($userEnv.$key)" -ForegroundColor Green } } # Special handling for PATH - merge both System and User $systemPath = $systemEnv.Path -split ";" | Where-Object { $_ -ne "" } $userPath = $userEnv.Path -split ";" | Where-Object { $_ -ne "" } $combinedPath = ($systemPath + $userPath) -join ";" [System.Environment]::SetEnvironmentVariable("Path", $combinedPath, [System.EnvironmentVariableTarget]::Process) Write-Host "`n[Path Variable Merged]:" -ForegroundColor Yellow Write-Host "System PATH: $([System.Environment]::GetEnvironmentVariable('Path', 'Machine'))" -ForegroundColor Blue Write-Host "User PATH: $([System.Environment]::GetEnvironmentVariable('Path', 'User'))" -ForegroundColor Blue Write-Host "Updated PATH: $combinedPath" -ForegroundColor Green Write-Host "`nEnvironment variables refreshed successfully!" -ForegroundColor Green } |