/Out (devenv.exe)
Applies to: 
Visual Studio 
Visual Studio for Mac
Note
This article applies to Visual Studio 2017. If you're looking for the latest Visual Studio documentation, see Visual Studio documentation. We recommend upgrading to the latest version of Visual Studio. Download it here
Specifies a file to store and display errors when you run, run and exit, upgrade, build, rebuild, clean, or deploy a solution.
Syntax
devenv /Out FileName
Arguments
FileName
Required. The path and name of the file to receive output when you build an executable.
Remarks
If a nonexistent file name is specified, the file is created automatically. Otherwise, the file already exists, and the results are appended to the existing contents of the file.
Command-line build errors are displayed in the Command window and the Solution Builder view of the Output window. This switch is useful for viewing results of unattended builds.
Example
This example runs MySolution and writes errors to the file MyErrorLog.txt.
devenv /run "%USERPROFILE%\source\repos\MySolution\MySolution.sln" /out "C:\MyErrorLog.txt"