Batch redirect stdout to null

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. A workaround that may look a bit intimidating is grouping the command line and escaping the redirection:.

What this does is turn the part between parentheses into a "literal" uninterpreted string that is passed to the command interpreter of the newly started process, which then in turn does interpret it. So the interpretation of the parenthesis and redirection is delayed, or deferred. A safer way to redirect START ed commands' output would be to create and run a "wrapper" batch file that handles the redirection.

The batch file would look like this:. To get rid of screen output sent directly to the Console, either run the program in a separate window using the START command , or clear the screen immediately afterwards CLS. Nothing is impossible, not even redirecting the Console output. The commands test. Be careful when using workarounds like these, they may be broken in future or even past Windows versions. However following will do almost the opposite of what some may expect copy foo.

Mawg I don't think it does. It's probably something specific to your usage scenario. SamHabiel Not really. The question is about stderr. Referenced page is here: technet.

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The Overflow Blog. Stack Gives Back Walf 1 1 gold badge 11 11 silver badges 19 19 bronze badges. Thyag Thyag 4 4 silver badges 6 6 bronze badges. Superb, I've been struggling to understand this topic for ages, finally I know how to use it. Explicit commands are the best way to explain and to memorize. Love this answer, thank you — Crescent Fresh. It could result in errors for a number of reasons, including: Inadequate permissions on the file s you're attempting to archive or on the file that you're attempting to write to Lack of disk space in order to create the archive.

Zibri Zibri 4 4 silver badges 9 9 bronze badges. Here is some handy information from the ABSG: "Redirection simply means capturing output from a file, command, program, or script and sending it as input to another file, command, program, or script. Michael Treanor Michael Treanor 97 4 4 bronze badges. No, redirections are handled left to right. In your example, standard output is redirected to filename , then standard error is redirected to wherever standard output is currently going to filename.

If it was the opposite way around, standard error would end up on the terminal while only standard output was redirected to filename. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password.

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