I need to store the output of a command line in a variable. How can I do this?


3 Answers 3


Provided a simple batch file test.cmd with the contents:

echo jscott

You can set the output into a variable with the following command line:

FOR /F "tokens=*" %a in ('test.cmd') do SET OUTPUT=%a

Used on the command line like this:

Environment variable OUTPUT not defined
C:\>FOR /F "tokens=*" %a in ('test.cmd') do SET OUTPUT=%a

Should you want to use the FOR within a batch file, rather than command line, you need to change %a to %%a.

  • Your prompt doesn't have > for some reason which makes reading the commands more difficult since "C:\SET", for example, starts out looking like a path. Mar 10, 2011 at 15:22
  • @Dennis Edited. Sorry about that, should have used copy/paste.
    – jscott
    Mar 10, 2011 at 15:42

This is how I do this:

vol c: > result.txt
set /p DATA=<result.txt
echo %DATA%
del result.txt

If result.txt has more than 1 line, only the top line of the file is used for %DATA%. You could also make result.txt into a variable itself, such as %OUTPUT%.


You can pipe the command into something like:

command > somefile

What you see above sends the output to a named file. If file does not exist, it creates one. Overwrites existing file And you can also do this:

command >> somefile

This appends the output to contents of a named file or creates a file if none exists

See also here: Using command redirection operators

  • 6
    Would you please expand your answer to explain how this stores anything in a variable?
    – jscott
    Mar 10, 2011 at 13:48
  • i want to store output in variable .... and i try this method but it is failed ansd the output of command : commandline 1>fiel.txt what is "1" mean ??? and the file didn't creat Mar 10, 2011 at 13:50

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