CMD：如何将Java -version的结果写入/打印到某些文件

Question

I try to execute:

    cmd /c java -version > someFile.txt
    cmd /c echo java -version > someFile.txt

But nothing is written to the file I'm redirecting to.

Answer 1

Capture stderr instead of stdout:

java -version 2> someFile.txt
java -fullversion 2> someFile.txt
cmd /c java -version 2> someFile.txt

This explains why Java writes the help to stderr:

We should think very, very carefully before ever fixing this bug. It's obviously the wrong thing to print version information to stderr, but since we've been doing that since the beginning of time it seems likely that we'll break existing systems built on top of Java if we change it now. If we do decide to change this then it must wait until the Tiger release so that adequate testing can be done.

Answer 2

Java writes this information to Standard Error not Standard Output so you need to redirect the correct channel

cmd /c java -version 2> someFile.txt

This works.