You can avoid the commas by using /-C on the DIR command.
FOR /F "usebackq tokens=3" %%s IN (`DIR C:\ /-C /-O /W`) DO (
SET FREE_SPACE=%%s
)
ECHO FREE_SPACE is %FREE_SPACE%
If you want to compare the available space to the space needed, you could do something like the following. I specified the number with thousands separator, then removed them. It is difficult to grasp the number without commas. The SET /A is nice, but it stops working with large numbers.
SET EXITCODE=0
SET NEEDED=100,000,000
SET NEEDED=%NEEDED:,=%
IF %FREE_SPACE% LSS %NEEDED% (
ECHO Not enough.
SET EXITCODE=1
)
EXIT /B %EXITCODE%
UPDATE:
Much has changed since 2014. Here is a better answer. It uses PowerShell which is available on all currently supported Microsoft Windows systems.
The code below would be much clearer and easier to understand if the script were written in PowerShell without using cmd.exe as a wrapper. If you are using PowerShell Core, change powershell to pwsh.
SET "NEEDED=100,000,000"
SET "NEEDED=%NEEDED:,=%"
powershell -NoLogo -NoProfile -Command ^
$Free = (Get-PSDrive -Name 'C').Free; ^
if ($Free -lt [int64]%NEEDED%) { exit $true } else { exit $false }
IF ERRORLEVEL 1 (
ECHO "Not enough disk space available."
) else (
ECHO "Available disk space is adequate."
)
