Redirect DOS Output Only if there is Output?

Question

I have a series of lines in a batch file (.bat) running on a Windows machine, e.g.: start /b prog.exe cmdparam1 cmdparam2 > test1.txt start /b prog.exe cmdparam1 cmdparam2 > test2.txtSometimes proj.exe returns nothing (empty) instead of useful data. In those cases I want to not generate a text file, is this something easily doable on the batch file side of things? The current behavior is that a text file is always created, in the case of empty output it's just a blank file.

Answer 1

if the output file is empty , or has size of 0 bytes, just delete it.

Your bigger problem is if the input is blocking, that is, no further processing

UNTIL there is input. So if there is no input, then nothing gets sent into the

pipeline, and your program blocks, sits there, and hangs

THAT is a bigger problem