The output file stores all the commands you enter at the Survey Command Line, including results from the query commands. The format of the output file is the same language or format as the Survey Command Language.
You can create, edit, or delete the output file using the commands in the Output File menu in the Survey Command Window. You can determine the name of the current output file using the Use Output File setting in the Survey User Settings dialog box.
The output file for each network in a survey database is saved to Civil 3D Projects\<named> Survey Database\<named> Network\Output.txt.