@echo off
setlocal EnableDelayedExpansion
echo CMD 命令帮助>CMD命令帮助.txt
echo.>>CMD命令帮助.txt
for /f %%i in ('help^|findstr "^[A-Z]"') do (
cls
@echo.
@echo 正在创建 %%i 命令帮助，请稍候... ...
@echo.
echo * * * * * * * * * * * * * * *>>CMD命令帮助.txt
echo.>>CMD命令帮助.txt
echo %%i>>CMD命令帮助.txt

echo.>>CMD命令帮助.txt
help %%i>>CMD命令帮助.txt
)

看看这个帖子，也许你会发现并不如此简单^_^

生成《CMD命令速查手册》的批处理
http://www.cn-dos.net/forum/viewthread.php?tid=18321&fpage=3