@echo off
setlocal enabledelayedexpansion
for /f %%a in ('dir /b /od C:\test\b\*.txt') do (
    set num=%%~na
)
for /f %%a in ('dir /b /od C:\test\a\*.txt') do (
    set /a num+=1
    move C:\test\a\%%a C:\test\b\!num!.txt
)
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@echo off
SETLOCAL ENABLEDELAYEDEXPANSION
::本批处理功能为将当前文件夹下所有以阿拉伯数字命名的文本文件“按序”排列
::注意事项：当前文件夹中的文本文件名必须为阿拉伯数字，数字之间不允许空格
::当然可以根据自己的需求继续完善
::修改start的值即可达到修改起始编号的目的

set start=11
set max=1
for %%a in (*.txt) do (
	if %%~na geq %start% (
		set %%~na=%%~na
		if !max! lss %%~na set max=%%~na
		set /a cnt+=1
	)
)

set /a start2=%start%
for /l %%a in (1,1,%cnt%) do (
	if defined !start2! (
		set !start2!=
		set /a start2+=1
	) else (
		set _tmp=!start2!
		call :reName !start2!
		set /a start2+=1
	)
)
echo done......
pause>nul
exit

:reName
for /l %%a in (1,1,%max%) do (
	set /a _tmp+=1
	if defined !_tmp! (
		echo ren !_tmp!.txt %1.txt
		set !_tmp!=
		pause>nul
		goto :eof
	)
)
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