fsutil volume diskfree c:
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$source = [System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String("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"))
Add-Type $source
$space = [Kernel32]::CheckSystemDiskFreeSpace()
$space = [System.Convert]::ToUInt64(($space[1] - $space[2])/1048576)
Write-Host 系统盘已用空间 $space MB
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@echo off
for /f "tokens=2,3" %%i in ('wmic logicaldisk C: get size^,freespace^,caption^|findstr C:') do @set a=%%i&set b=%%j
set /a s=(%b:~0,-3%-%a:~0,-3%)/1024*1000/1024
echo %s%MB
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powershell -c "$c=Get-WmiObject Win32_LogicalDisk -Filter \"DeviceID='C:'\";\"{0:F2}MB\" -f (($c.Size-$c.FreeSpace)/1mb)"
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type 
    WINBOOL* = uint32

    s64* = uint64

proc  getDiskFreeSpaceEx*(name: cstring, freeBytes,
    lpTotalNumberOfBytes,lpTotalNumberOfFreeBytes: var s64): WINBOOL
    {.stdcall, dynlib: "kernel32", importc: "GetDiskFreeSpaceExA", discardable.}

proc getusedspace*(name: cstring):auto {.discardable.} =
    var freeBytes, totalBytes, totalFreeBytes: s64
    getDiskFreeSpaceEx(name, freeBytes, totalBytes,totalFreeBytes)
    result = ((totalBytes - freeBytes) div 1024 div 1024)

echo "已经使用：", getusedspace("c:\\EFI"), "MB"
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powershell -c (gdr C).Used/1mb
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@echo off
SetLocal EnableDelayedExpansion
for /f "tokens=1,3" %%i in ('fsutil volume diskfree c:') do (
    set "a=%%i"
    set "b=%%j"
    echo !a! - !b!
)
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@echo off
SetLocal EnableDelayedExpansion
:: 常量初始化
set sharp=####################

:get_total_size
for /f "tokens=3" %%i in ('fsutil volume diskfree c:') do (set total=%%i&goto :get_free_size)
:get_free_size
for /f "tokens=3" %%i in ('fsutil volume diskfree c: ^|more +1') do (set free=%%i&goto :count)

:count
call :bignum_minus %total% %free% delta
echo %total% %free% 已用空间 %delta%
exit /b

::大数减法
:bignum_minus
    setlocal
    set num_a=%1
    set num_b=%2
    call :length %num_a% len_a
    call :length %num_b% len_b
    set /a max = len_a
    if %len_b% gtr %len_a% (set /a max=len_b, len_b=len_a&set num_a=%num_b%&set num_b=%num_a%)

    set /a minus = 0
    for /l %%n in ( 1, 1, %max% ) do (
        if %%n leq %len_b% (
            set /a dt = !num_a:~-%%n,1! - !num_b:~-%%n,1! - minus
        ) else (
            set /a dt = !num_a:~-%%n,1! - minus
        )
        if !dt! lss 0 (
            set /a buff[%%n] = dt + 10, minus=1
        ) else (
            set /a buff[%%n] = dt, minus=0
        )
    )

    set delta=#
    for /l %%a in (%max%, -1, 1) do set delta=!delta:#0=#!!buff[%%a]!
    endlocal &set %3=%delta:#=%
    goto :eof

::字符串长度计算
:length %str% %vname%
    setlocal
    set test=%~1_%sharp%
    set test=!test:~0,20!
    set test=%test:*_=%
    set /a len=20-(%test:#=1+%1)
    endlocal &set %2=%len%
    goto :eof
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@echo off
SetLocal EnableDelayedExpansion
for /f "tokens=1,3" %%i in ('fsutil volume diskfree c:') do (
    if "%%i" equ "可用字节总数" (
        set "free=%%j"
    ) else if "%%i" equ "字节总数" (
        set "total=%%j"
    )
)
echo !free!
echo !total!
pause
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@echo off
SetLocal EnableDelayedExpansion
set n=1
for /f "tokens=1,3" %%i in ('fsutil volume diskfree c:') do (
    if !n! equ 1 (
        set "free=%%j"
    ) else if !n! equ 2 (
        set "total=%%j"
    )
    set /a n+=1
)
echo !free!
echo !total!
pause
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>diskfree.cmd %COMPUTERNAME% C:
Total space: 137GB
Free space: 44GB
Used space: 93GB
Percent Used: 67%
Percent Free: 33%
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set /a "SystemSize=!total:~0,-6!-!free:~0,-6!"
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@echo off
SetLocal EnableDelayedExpansion
:: 常量初始化
set const=9876543210

:get_free_size
for /f "tokens=3" %%i in ('fsutil volume diskfree c:') do (set free=%%i&goto :get_total_size)
:get_total_size
for /f "tokens=3" %%i in ('fsutil volume diskfree c: ^|more +1') do (set total=%%i&goto :count)

:count
set /a Afoo=%total:~0,-5%, Abar=%total:~-5%
set /a Bfoo=%free:~0,-5%, Bbar=%free:~-5%
echo %Afoo% %Abar% %Bfoo% %Bbar%
set /a foo=Afoo-Bfoo, bar=Abar-Bbar
if %bar% leq 0 set /a foo-=1, bar=100000-(-bar)
echo,
echo %total% %free% 已用空间 %foo%%bar%
exit /b
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