xiaobat

@echo off&setlocal enabledelayedexpansion
set str=I love,bbs;bathome.net
for %%x in (%str%) do (set z=%%x&&set a=!z:.= !&&for %%b in (!a!) do echo %%b)
pause>nul

输出：
I
love
bbs
bathome
net
不知，楼主是否题目有问题，那来的cn,如是要有cn ,只能加个IF语句了

xiaobat

code
(
@echo off&setlocal enabledelayedexpansion
set str=I love,bbs;bathome.net
set k=0
for %%x in (%str%) do (set z=%%x&&set a=!z:.= !&&for %%b in (!a!) do (set /a k+=1&&if !k! equ 5 echo %%b))
pause>nul
)
输出：
net
如题要输出cn,只要把上面代码"echo %%b"改成"echo cn"