Executar aplicativo ou script externo

{-----------------------------------------------------------------------------
 - Executa programa Externo descrito em "Command", adcionando os Parametros
   "Params" na linha de comando
 - Se "Wait" for true para a execução da aplicação para esperar a conclusao do
   programa externo executado por "Command"
 - WindowState apenas é utilizado na plataforma Windows
 ---------------------------------------------------------------------------- }
procedure RunCommand(Command: String; Params: String; Wait : Boolean;
   WindowState : Word);
var
  {$ifdef MSWINDOWS}
  SUInfo: TStartupInfo;
  ProcInfo: TProcessInformation;
  Executed : Boolean ;
  PCharStr : PChar ;
  {$endif}
  ConnectCommand : PChar;
begin
  {$ifdef LINUX}
     Command := Trim(Command + ´ ´ + Params) ;
     if not Wait then
        Command := Command + ´ &´ ;  { & = Rodar em BackGround }
     {$IFNDEF FPC}
       ConnectCommand := PChar(Command);
       Libc.system(ConnectCommand);
     {$ELSE}
       Shell(Command)
     {$ENDIF}
  {$endif}
  {$ifdef MSWINDOWS}
     Command  := Trim(Command) ;
     PCharStr := PChar(Trim(Params)) ;
     if Length(PCharStr) = 0 then
        PCharStr := nil ;

     if not Wait then
        ShellExecute(0,´open´,PChar(Command),PCharStr, nil, WindowState )
//        winexec(ConnectCommand, WindowState)
     else
      begin
        ConnectCommand := PChar(Trim(Command + ´ ´ + Params));
        PCharStr := PChar(ExtractFilePath(Command)) ;
        if Length(PCharStr) = 0 then
           PCharStr := nil ;
        FillChar(SUInfo, SizeOf(SUInfo), #0);
        with SUInfo do
        begin
           cb          := SizeOf(SUInfo);
           dwFlags     := STARTF_USESHOWWINDOW;
           wShowWindow := WindowState;
        end;

        Executed := CreateProcess(nil, ConnectCommand, nil, nil, false,
                    CREATE_NEW_CONSOLE or NORMAL_PRIORITY_CLASS, nil,
                    PCharStr, SUInfo, ProcInfo);

        try
           { Aguarda até ser finalizado }
           if Executed then
              WaitForSingleObject(ProcInfo.hProcess, INFINITE);
        finally
           { Libera os Handles }
           CloseHandle(ProcInfo.hProcess);
           CloseHandle(ProcInfo.hThread);
        end;
      end;
  {$endif}
end;

interface
Uses    {$ifdef MSWINDOWS}
      Windows, ShellAPI
    {$else}
        Libc
    {$endif} ;