add path to the front of the variable instead of the back

scripts/obtain/dotnet-install.ps1

@@ -336,7 +336,7 @@ foreach ($DownloadLink in $DownloadLinks) {
 $BinPath = Get-Absolute-Path $(Join-Path -Path $InstallRoot -ChildPath $BinFolderRelativePath)
 if (-Not $NoPath) {
     Say "Adding to current process PATH: `"$BinPath`". Note: This change will not be visible if PowerShell was run as a child process."
-    $env:path += ";$BinPath"
+    $env:path = "$BinPath;" + $env:path
 }
 else {
     Say "Binaries of dotnet can be found in $BinPath"

scripts/obtain/dotnet-install.sh

@@ -631,7 +631,7 @@ install_dotnet
 bin_path=$(get_absolute_path $(combine_paths $install_root $bin_folder_relative_path))
 if [ "$no_path" = false ]; then
     say "Adding to current process PATH: ``$bin_path``. Note: This change will be visible only when sourcing script."
-    export PATH=$PATH:$bin_path
+    export PATH=$bin_path:$PATH
 else
     say "Binaries of dotnet can be found in $bin_path"
 fi