构建Application工程目录

mkdir edk2/ShellPkg/Application/ShellHello

目录内容如下：

 编写 ShellHello.c

/* edk2/ShellPkg/Application/ShellHello/ShellHello.c*/
#include <Uefi.h>
#include <Library/UefiLib.h>
#include <Library/DebugLib.h>
#include <Library/ShellCEntryLib.h>

EFI_STATUS                                                                                                                           
EFIAPI
ShellHelloMain (
  IN EFI_HANDLE ImageHandle,
  IN EFI_SYSTEM_TABLE *SystemTable
  )
{
  SystemTable->ConOut->OutputString(SystemTable->ConOut, L"Hello world");

  return EFI_SUCCESS;
}

定义编译脚本

/* edk2/ShellPkg/Application/ShellHello/ShellHello.inf */
[Defines]
  INF_VERS