Redirect stderr and stdout to a file windows

Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Stack Gives Back Safety in numbers: crowdsourcing data on nefarious IP addresses. Featured on Meta. New post summary designs on greatest hits now, everywhere else eventually. Related Ideally I'd like the log file to look something like:. Might be better to use this than delimit those. I added a line in the log, to show the full line then the parameters.

You can see where the problem was if it's a matter of bad arguments. With those being said, you have to test the script and see if the exception is actually sent to stderr or, like some other softwares, to stdout even if an error occured. If the batches aren't run in sequence but rather simultaneously you need to find something to uniquify the temp variable:.

This will avoid clashes between multiple running batches. However, you are currently not using anything to lock writing to your log file and things may appear out of place when other things get written to it with other batches you might get interleaving in the echo and type commands or, when you're redirecting output of java to that file as well, then it may get mixed up with regular output of the java program:.

You can use another file as semaphore for writing to the log to avoid the batch outputs getting mixed: create the file [ copy nul file ] when you want to write to the log, delete it afterwards and before you attempt to create it check whether it is actually there and wait until it disappears.

You can't do anything about the stdout log being mixed into the file, though, except you use that temp file approach for stdout as well and simply type the stdout log to log.

You can redirect stderr separately from stdout in a. To redirect stderr, use something like this:. Then, you can check the command. Or you could concat it in any case. If you like you could also echo the command that you ran, into the final log file.

I don't know if java. It should, if it is a good citizen on Windows. This might be an alternative way of finding out if the Java app exited with an error condition. But this is no guarantee that stderr got nothing. For example, a Java app might print out an exception and stack trace, and then exit with code 0, which indicates success. Redirection A very common task in batch files is sending the output of a program to a log file. DIR SomeFile. PING So you get a cumulative logfile, showwing the results from all runs of the process - typically more useful.

HOW TO? Background info from MSKB While the accepted answer to this question is correct, it really doesn't do much to explain why it works, and since the syntax is not immediately clear I did a quick google to find out what was actually going on.

Example The command dir file. Happy trails