What I wanted to do is to generate some kind of streaming log of my cmd. SolveProblem 73 1 1 silver badge 9 9 bronze badges. A process has 3 standard File handles -- StandardInput , StandardOutput , and StandardError -- which the CMD shell can redirect to a pipe or disk file, but a console application's behavior may change or break if the standard handles aren't console files.
Note that the program's output is not "cmd output". CMD only sets the inherited standard handles for OS resources e. In particular, CMD is not the console. Add a comment. Active Oldest Votes. Wander3r Wander3r 1, 16 16 silver badges 26 26 bronze badges. Buddy Happy Buddy Happy 11 1 1 bronze badge. Joey k 80 80 gold badges silver badges bronze badges. SolveProblem SolveProblem 73 1 1 silver badge 9 9 bronze badges. Still, opening a new cmd from the main on did not change the case.
Yes, yes I know. I am trying to stream the output into the log file not to harness it after the termination of the process — weam elsahar. The process flushes the buffer when the buffer is full or when it exits.
Also, a pipe or disk file is not a console file. You see? What did you get? It looks like CMD. We'll see how we can use this later. Ok, now that we get the idea of this concept of "streams", let's play with it. Copy the following code into Notepad and save it as "test. It is said Console cannot be redirected, and I believe that's true. I can assure you I did try! In this case, we could also have used test. With the NUL device that's no problem, but when redirecting to a file one of the redirections will lock the file for the other redirection.
The result will be an empty logfile. The result is that no output stream at all gets displayed in the console window. However, you can see the error messages by typing output. This will open the file in your default text file viewer. As you can see, any error messages from the command are output to the error file. All of the approaches above result in multiple files.
One file is for the standard output stream and the other is for the standard error stream. If you want to include both of these outputs to the same file, you can do that too.
To do this, you just need to redirect all output to the same file using the following command. Using the example above, if you only want Standard Output and no Standard Error at all, you can use the following command:. You can perform any of the same output commands above from inside a BAT file and the output from that line will go to the output file you specify.
This is a useful way to see whether any commands within a BAT file had any errors when they tried to run. Ryan has been writing how-to and other technology-based articles online since
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