for /f "delims== tokens=2" %i in ('wmic logicaldisk where "caption='d:'" get freespace /value') do @if %i gtr 100000000000 (copy a.txt d:\) else (copy a.txt e:\)
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@echo off
Setlocal enabledelayedexpansion
for /f "skip=1 tokens=1-6" %%a in ('wmic logicaldisk get caption^,drivetype^,freespace') do (if "%%b"=="3" (set "size=%%c"
)
)
if %size% gtr 107374182400 (copy a.txt d:\) else (copy a.txt e:\)
pause
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@echo off&setlocal enabledelayedexpansion
for /f "delims== tokens=2" %%i in ('wmic logicaldisk where "caption='d:'" get freespace /value') do set freespace=%%i
set _100g=107374182400

rem 获取字符串长度
set n=
:loop1
set /a n+=1
if "!freespace:~%n%,1!"=="" (goto next1) else (goto loop1)
:next1
rem %n%为已获取到的字符串长度，100G的字符串长度为12，两者相比较
if %n% equ 12 (call :equ) else (if %n% gtr 12 (call :gtr) else (call :lss))
endlocal
goto:eof

:gtr
set /a v=%n%-12
rem z0的第一个参数长度最小，第二个参数长度最大，第三个参数%v%为两个字符串长度的差
call :z0 %_100g% %freespace% %v%
goto:eof

:lss
set /a v=12-%n%
call :z0 %freespace% %_100g% %v%
goto:eof

:equ
call :z0 %freespace% %_100g% 0
goto:eof

:z0
setlocal
if %3 equ 0 goto next2
rem 将长度最小的字符串前面补0，使两个字符串长度相同，然后再进行字符串比较
set str=%1
set n=
:loop2
set /a n+=1
set str=0%str%
if %n% equ %3 (goto next2) else (goto loop2)
:next2
rem %str%为补0之后的字符串
if "%2" gtr "%str%" (copy a.txt d:\) else (copy a.txt e:\)
endlocal
goto:eof
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