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batch-filescriptingwmic

Get the result of a WMIC command and store it in a variable

I have seen some batch scripts working that way, including all around stackoverflow.

My question is simple: Why the MEM part isn't working?

@echo OFF

SET CPU="$CPU"

echo CPU: %NUMBER_OF_PROCESSORS%

FOR /F "delims=" %%i IN ('wmic computersystem get TotalPhysicalMemory') DO set MEM=%%i

echo MEM: %MEM%
Solution

  • That's simple. wmic computersystem get TotalPhysicalMemory outputs three lines of text:

    TotalPhysicalMemory
12867309568
<blank line>

    So your for-loop does three iteration. In the first one MEM is set to TotalPhysicalMemory, in the second one it's set to 12867309568 and finally it becomes . So your output is empty.

    This is quite ugly but will solve your problem:

    @echo OFF
setlocal enabledelayedexpansion
SET CPU="$CPU"
echo CPU: %NUMBER_OF_PROCESSORS%
FOR /F "delims= skip=1" %%i IN ('wmic computersystem get TotalPhysicalMemory') DO (
    set MEM=%%i
    goto STOP

)
:STOP
echo MEM: !MEM!

    skip=1 will ignore TotalPhysicalMemory and goto STOP will break the loop after the first iteration.