How to: Set Environment Variables for the Visual Studio Command Line
The VsDevCmd.bat file sets the appropriate environment variables to enable command-line builds. For more information about VsDevCmd.bat, see Knowledge Base article Q248802.
The VsDevCmd.bat file is a new file delivered with Visual Studio 2017. Visual Studio 2015 and earlier versions used VSVARS32.bat for the same purpose. This file was stored in \Program Files\Microsoft Visual Studio\Version\Common7\Tools or Program Files (x86)\Microsoft Visual Studio\Version\Common7\Tools.
If the current version of Visual Studio is installed on a computer that also has an earlier version of Visual Studio, you should not run VsDevCmd.bat and VSVARS32.BAT from different versions in the same Command Prompt window. Instead, you should run the command for each version in its own window.
To run VsDevCmd.BAT
From the Start menu, open the Developer Command Prompt for VS 2017. It's in the Visual Studio 2017 folder.
Change to the \Program Files\Microsoft Visual Studio\Version\Offering\Common7\Tools or \Program Files (x86)\Microsoft Visual Studio\Version\Offering\Common7\Tools subdirectory of your installation. (Version is 2017 for the current version. Offering is one of Enterprise, Professional or Community.)
Run VsDevCmd.bat by typing VsDevCmd.
VsDevCmd.bat can vary from computer to computer. Do not replace a missing or damaged VsDevCmd.bat file with a VsDevCmd.bat from another computer. Instead, rerun setup to replace the missing file.