JSI Tip 1080. A better way to determine the freespace on a disk drive, in batch.

In tip 1071, we used CHKDSK in a batch script, to determine the free space on a disk drive.

Thanks to Chris Dickerson, we can use DF.

Typing DF /? at a command prompt, displays:

 Chris Dickerson (R) DiskFree Version 1.00.080Copyright (c) Chris Dickerson 1999. All rights reserved.Free for use by anyoneDF                 Display space info on all fixed system drivesDF /?              HelpDF [path]          UNC or regular path, displays freespace available to youDF [path] [bytes]  In a batch file, returns a "1" if there is enough space for                   [bytes]

Typing DF, displays information similar to:

Chris Dickerson (R) DiskFree Version 1.00.080Copyright (c) Chris Dickerson 1999. All rights reserved.Free for use by anyoneDrive  free             total            capacity-----  ---------------- ---------------- --------C:    817,383,424      2,138,540,032    38.22 %D:    1,228,214,272    2,146,764,800    57.21 %

Typing DF (c: or \ServerC$) displays:

Chris Dickerson (R) DiskFree Version 1.00.080Copyright (c) Chris Dickerson 1999. All rights reserved.Free for use by anyoneTotal free bytes available to you: 816,039,936Total bytes available to you     : 2,138,540,032

Typing DF BytesRequired sets the ERRRORLEVEL to 1 if there is enough room for BytesRequired, or 0 if there is not. Using the above display:

DF C: 500000 sets ERRORLEVEL to 1.
DF C: 900000 sets ERRORLEVEL to 0

I have scripted DFree.bat to return the following environment variables:

The syntax is:

DFree

Using the above C: display, DRV_FREE is set to 817383424 and DRV_TOT is set to 2138540032.

DFree.bat contains:

@echo offif not "%1"

"" goto begin@echo Syntax: DF DriveLettergoto end:beginfor /f "Skip=4 Tokens=1,2 Delims=:" %%i in ('df.exe %1') do call :parse "%%i" "%%j"goto end:parseif /i %1

"Total free bytes available to you" goto freeset DRV_TOT=%2set DRV_TOT=%DRV_TOT: =%set DRV_TOT=%DRV_TOT:"=%set DRV_TOT=%DRV_TOT:,=%set /a DRV_TOT=%DRV_TOT%goto end:freeset DRV_FREE=%2set DRV_FREE=%DRV_FREE: =%set DRV_FREE=%DRV_FREE:"=%set DRV_FREE=%DRV_FREE:,=%set /a DRV_FREE=%DRV_FREE%:end