如何在批处理中生成随机字符串，用于密码之类？
How to generated random string for password?
保存下面的代码为randstr.bat即可：
@echo off & setlocal enabledelayedexpansion
if [%1]==[] goto help
if [%1]==[/?] goto help
REM can't support %^!&
set str=ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890()_`[]\',./{}:"<>?;+-~@#$*=
set len=%1
for /l %%a in (1 1 %len%) do (
if [%2]==[/s] (
set /a n=!random!%%89
) else (
set /a n=!random!%%61
)
REM call echo !n! = %%str:~!n!,1%%
call set a=!a!%%str:~!n!,1%%
)
echo %a%
goto :EOF
:help
echo Random string generator, v1.0
echo Copyright 2015-2016, Kingron Lu^<kingron@163.com^>
echo This is free software; There is NO warranty.
echo.
echo Usage: %~n0 [length] [/s]
echo.
echo /s Include special charater
echo.
:end