A command file is a response file used to extend command-line input to NMAKE.
You can split input to NMAKE between the command line and a command file. Use the name of a command file (preceded by @) where you normally type the input information on the command line.
Use a command file for:
A command file is not the same as a description file. For information about description files, see Description files.
To provide input to NMAKE with a command file, type
nmake @commandfile
In the commandfile field, enter the name of a file containing the same information as is normally entered on the command line.
NMAKE treats line breaks that occur between arguments as spaces. Macro definitions can span multiple lines if you end each line except the last with a backslash (\). Macro definitions that contain spaces must be enclosed by quotation marks, just as if they were entered directly on the command line.