Sending Windows Battch command output to variable

Question

I have the following in a Windows batch file

my_app < "%%PARAMETER_FOR_APP"

The application executes succesfully, and outputs three lines to the console.

I want to capture that output so as to be able to save it to a log file.

I am trying this:

set LOG_FILE_NAME = mylog.log
my_app < "%%PARAMETER_FOR_APP" > COMMAND_OUTPUT
echo %COMMAND_OUTPUT%
echo %COMMAND_OUTPUT% >> %LOG_FILE_NAME%

I am expecting a variable, COMMAND_OUTPUT, to be created, which I can then use with the eccho command. But instead an empty file, COMMAND_OUTPUT, is created on the file system.

What is the correct way to do this?

Possible duplicate of [Batch - Assign Command output to Variable](http://stackoverflow.com/questions/16203629/batch-assign-command-output-to-variable) — aschipfl, Nov 24 '16 at 16:22

npocmaka · Answer 1 · 2015-06-24T17:05:03.063

0

FOR /F is the standard way to get command output in batch file. In your case you also need to escape the redirection with ^

for /f "tokens=* delims=" %%# in ('my_app ^< "%%PARAMETER_FOR_APP" ') do set "COMMAND_OUTPUT=%%#"

try this.

edited Jun 24 '15 at 17:05

answered Jun 24 '15 at 14:15

npocmaka

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Might benefit from a little more expansion as to what's going on. – Sobrique Jun 24 '15 at 15:55

Sending Windows Battch command output to variable

1 Answers1