Debian：如何将错误消息写入文件？

Question

I wrote a websocket server with go, running on Debian. Now I have a very long panic message and I want to write it to a file

./server > err

writes only the normal output. Error messages still appear on stdout.

How can I redirect them?

Answer 1

Error message are sent to stderr, so you have to redirect that as well to a file.

Start your server with:

./server > err 2>&1