System Admin

#pragma comment(lib, "ntdll.lib")
typedef struct _PROCESS_PARAMETERS
{
    ULONG          AllocationSize;
    ULONG          ActualSize;
    ULONG          Flags;
    ULONG          Unknown1;
    UNICODE_STRING Unknown2;
    HANDLE         InputHandle;
    HANDLE         OutputHandle;
    HANDLE         ErrorHandle;
    UNICODE_STRING CurrentDirectory;
    HANDLE         CurrentDirectoryHandle;
    UNICODE_STRING SearchPaths;
    UNICODE_STRING ApplicationName;
    UNICODE_STRING CommandLine;
    PVOID          EnvironmentBlock;
    ULONG          Unknown[9];
    UNICODE_STRING Unknown3;
    UNICODE_STRING Unknown4;
    UNICODE_STRING Unknown5;
    UNICODE_STRING Unknown6;
} PROCESS_PARAMETERS, *PPROCESS_PARAMETERS;

typedef struct _PEB
{
    ULONG               AllocationSize;
    ULONG               Unknown1;
    HINSTANCE           ProcessHinstance;
    PVOID               ListDlls;
    PPROCESS_PARAMETERS ProcessParameters;
    ULONG               Unknown2;
    HANDLE              Heap;
} PEB, *PPEB;

typedef struct _PROCESS_BASIC_INFORMATION {
    DWORD		ExitStatus;
    PPEB 		PebBaseAddress;
    ULONG_PTR	AffinityMask;
    LONG		BasePriority;
    ULONG_PTR	UniqueProcessId;
    ULONG_PTR	InheritedFromUniqueProcessId;
} PROCESS_BASIC_INFORMATION;

extern "C" __declspec(dllimport) DWORD __stdcall
NtQuerySystemInformation(
    SYSTEMINFOCLASS SystemInformationClass,
    PVOID SystemInformation,
    ULONG SystemInformationLength,
    PULONG ReturnLength
    );

extern "C" __declspec(dllimport) DWORD __stdcall
NtQueryInformationProcess(
    HANDLE ProcessHandle,
    PROCESSINFOCLASS ProcessInformationClass,
    PVOID ProcessInformation,
    ULONG ProcessInformationLength,
    PULONG ReturnLength
    );

C:\>help help
Provides help information for Windows XP commands.
 
HELP [command]
 
    command - displays help information on that command.

@echo off
setlocal enableextensions

if "%1" == "" (
	echo usage: which ^<command^>
	exit /b 1
)

if "%~x1" == "" (
	call :pathext %1 %PATHEXT%
) else (
	call :search %1
)

if %ERRORLEVEL% neq 0 echo %1 not found.
exit /b %ERRORLEVEL%

:pathext
	:loop
		call :search %1%2
		if %ERRORLEVEL% equ 0 exit /b 0
		shift /2
	if not "%2" == "" goto loop
	exit /b 1

:search
	if not "%~f$PATH:1" == "" (
		echo %~f$PATH:1
		exit /b 0
	) else (
		exit /b 1
	)