中国DOS联盟

@echo off
for /f "delims=" %%i in ('findstr "1 3 4 6 7" a.txt') do (set num=%%i
>>test2.txt call,echo %%num%%
)
pause

@echo off
setlocal enabledelayedexpansion
set row=0
type nul>"C:\test\test2.txt"
for /f "tokens=1,2* delims=:" %%a in ('findstr /n .* "C:\test\test1.txt"') do (
  set /a row+=1
  if !row! equ 1 (>>"C:\test\test2.txt" echo %%b)
  if !row! equ 3 (>>"C:\test\test2.txt" echo %%b)
  if !row! equ 4 (>>"C:\test\test2.txt" echo %%b)
  if !row! equ 6 (>>"C:\test\test2.txt" echo %%b)
  if !row! equ 7 (>>"C:\test\test2.txt" echo %%b)
)

@echo off&setlocal enabledelayedexpansion
for /f "delims=" %%i in (test1.txt) do (
     set str=%%i
     if defined str (
        set /a n+=1
        set _!n!=!str!
     )
)
for %%i in (1 3 4 6 7) do echo !_%%i!>>test2.txt
pause>nul

@echo off&setlocal enabledelayedexpansion
for /f "delims=" %%i in ('findstr/n ".*" test1.txt') do (
set str=%%i&set str=!str:*:=!
set/a n+=1
set _!n!=!str!
)
for %%i in (1 3 4 6 7) do echo.!_%%i!>>test2.txt
pause

@echo off
for %%a in (1 3 4 6 7) do set .%%a=a
for /f "tokens=1* delims=:" %%a in ('findstr/n ".*" test1.txt') do (
  if defined .%%a echo.%%b
)
pause