How to transform the output of a command into a variable in CMD?

One option is to use Windows PowerShell , which can be viewed as a command prompt of Windows (cmd) more modern and powerful (although it is even more than that).

Example

To set the output of the command mountvol in a variable, passing parameters to this command (in this case, I passed the parameter /? ):

PS C:\Users\caffé> $mountVolHelp = mountvol /?

Now, to see the contents of the $mountVolHelp variable, with all text including line breaks, just enter its name:

PS C:\Users\caffé> $mountVolHelp
Cria, exclui ou lista um ponto de montagem de volume.

MOUNTVOL [unidade:]caminho NomeVolume
MOUNTVOL [unidade:]caminho /D
MOUNTVOL [unidade:]caminho /L
MOUNTVOL [unidade:]caminho /P
                            ...
    caminho     Especifica a pasta NTFS existente onde residirá o ponto de
                montagem.
    NomeVolume  Especifica o nome de volume que é o destino do ponto de
                montagem.
    /D          Remove o ponto de montagem do volume da pasta especificada.
    /L          Lista o nome do volume montado para a pasta especificada.
                            ...
    /R          Remove pastas e configurações do Registro de pontos de
                montagem de volume que não estão mais no sistema.
    /N          Desativa a montagem automática de novos volumes.
    /E          Reativa a montagem automática de novos volumes.
                            ...

An example loop in PowerShell

The code below prints the contents of $mountVolHelp by adding the text "Ra!" at the beginning of each line:

foreach ($linha in $mountvolHelp) {"Rá! " + $linha}

As in the for each of various programming languages, in the above code the variable $linha is created inside the loop itself and at each iteration it receives the value of a line of the variable $mountvolHelp , which in this context is treated as a list of lines.

Another example of using for each

PS C:\Users\caffé> foreach ($numero in 1,2,3) {$numero}
1
2
3

In the example above, "1,2,3" was treated by for each as a list of numbers.

Example of reading in Windows environment variables PowerShell

To read% UserProfile%, for example, one of the ways is:

PS C:\Users\caffé> $env:UserProfile
C:\Users\caffé

The second line of the code above is output from the command. To assign the value of this environment variable to another variable in PowerShell:

PS C:\Users\caffé> $UserProfile = $env:UserProfile

Now the variable $UserProfile contains " C: \ Users \ caffé ".

Conclusion

With Windows PowerShell you can do everything you do with "cmd", only easier, with more features and more documentation.

To open Windows Powersheel, just press the "windows" key and type "powershell", it will be shown a shortcut to "Windows PowerShell", which at first looks very much like "cmd". Another option is to type "powershell" in the "cmd" itself. You will immediately see a "PS" at the beginning of the command prompt line, indicating that you are now in PowerShell.

Two simple ways:

aplicacaoOuComando arg0 arg1 > temp.txt
set /p VAR=<temp.txt

other:

for /f %%i in ('aplicacaoOuComando arg0 arg1') do set VAR=%%i

EDITION

The for /f command is a parse of files. Theoretically speaking, if you pass a command, it sends the STDOUT to the input of this parse.

Hello. I got a BAT file! This forum was very helpful, thank you to the participants.

Based on the information in this forum, I was able to do a small sequence of commands that saves the first line of the output of a command in a variable. It looks like this:

"COMANDO QUE TENHA SAÍDA" > VARtemp.txt
set /p SuaVariavel=<VARtemp.txt
DEL VARtemp.txt

Depending on your command, the output may contain multiple lines, tabs, and characters. This method will write to "YourVariable" only the first line, which depending on it may be empty, without information.

If you need to edit the contents of the VARtemp.txt file with commands such as FIND so that you can only have the content you want.

Open the VARtemp.txt output file and analyze your content to study the most effective method for editing it via commands and extract only the content you want for your variable.

In my case, I just needed to know if there was a certain character in my output for the VARtemp.txt file. I used the following command:

"COMANDO QUE TENHA SAÍDA" > VARtemp.txt

FIND /i "CARACTERE" "VARtemp.txt"
if NOT %ERRORLEVEL% EQU 0 ( 
  set /p SuaVariavel= "EXISTE O CARACTERE"
  DEL "VARtemp.txt"
  GOTO INICIO
)
set /p SuaVariavel= "NÃO EXISTE O CARACTERE"

:INICIO
REM ### Continuação do script BAT ###

Good luck and good work.

Att

Thiago Morais

Probably the set is changing the variable The & & has the line break rule to call another command.

I hope I have helped