Windows 批处理脚本：将所有输出重定向到文件
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Windows Batch Script: Redirect ALL output to a file
提问by Nicolas
I am running various Java benchmarks and would like to archive the results. I execute the (dacapo) benchmark like this:
我正在运行各种 Java 基准测试并希望将结果存档。我像这样执行（dacapo）基准测试：
C:\VM\jre\bin\java -jar C:\benchmarks\dacapo-9.12-bach.jar %arg1% > %time::=%
I pass the type of benchmark in over a parameter, thats what %arg1% is.
我通过一个参数传递了基准的类型，这就是 %arg1% 。
You can see that I am redirecting the output to a textfile. Unfortunately, the first and last line of the output is still printed in the console and not into the textfile:
您可以看到我正在将输出重定向到一个文本文件。不幸的是，输出的第一行和最后一行仍然打印在控制台中，而不是打印到文本文件中：
===== DaCapo 9.12 luindex starting =====
===== DaCapo 9.12 luindex PASSED in 2000 msec =====
Especially the last line would be important to have in the text file :)
特别是最后一行在文本文件中很重要:)
Is there a trick to force this behavior?
有什么技巧可以强迫这种行为吗？
回答by Zach Riggle
You must redirect STDOUTand STDERR.
您必须重定向STDOUT和STDERR。
command > logfile 2>&1
command > logfile 2>&1
STDINis file descriptor #0, STDOUTis file descriptor #1 and STDERRis file descriptor #2.
Just as "command > file" redirects STDOUTto a file, you may also redirect arbitrary file descriptors to each other. The >&operator redirects between file descriptors. So, 2 >& 1redirects all STDERRoutput to STDOUT.
STDIN是文件描述符#0，STDOUT是文件描述符#1，STDERR是文件描述符#2。
正如“command > file”将STDOUT重定向到文件一样，您也可以将任意文件描述符重定向到彼此。该>&运营商文件描述符之间重定向。因此，2 >& 1将所有STDERR输出重定向到STDOUT。
Furthermore, take care to add 2>&1at the end of the instruction because on Windows, the order of redirection is important as command 2>&1 > logfilewill produce an empty file, as Dawid added in the comments.
此外，注意2>&1在指令的末尾添加，因为在 Windows 上，重定向的顺序很重要，因为它command 2>&1 > logfile会产生一个空文件，正如 Dawid 在评论中添加的那样。
回答by Squeezy
Add 2>&1 to your command:
将 2>&1 添加到您的命令中：
C:\VM\jre\bin\java -jar C:\benchmarks\dacapo-9.12-bach.jar %arg1% 2>&1 > %time::=%
This will redirect STDERR to STDOUT which is then redirected into your textfile.
这会将 STDERR 重定向到 STDOUT，然后将其重定向到您的文本文件中。
