bestsea

1，
@echo off
for /l %%i  in (1 1 100) do echo %%i
pause
2,
@echo off
setlocal enabledelayedexpansion
for /l %%i in (1 1 50) do (set a=%%i & set /a b=!a!*2-1 &echo !b!)
pause
3,
@echo off
for %%I in (bbs bathome.net) do echo %%I
pause
4,
@echo off
for /f "tokens=1,2,3" %%i in (test.txt)  do echo %%i %%j %%k
pause

for /f "tokens=2" %%i in (test.txt) do echo %%i
pause