如何将fmt.Print和log.Print保存到Golang中的相同文件中

Question

In shell, I use go run file > output, but only fmt.Print are saved into output. All the log.Print still output to the screen! And after I searched on the Internet, I found I can set ouput directory for log, but how can I save both log and fmt in the same file?

Answer 1

The logger writes to STDERR while fmt.PrintXXX functions write to STDOUT.

You have two choices:

1) Capture STDERR to the file.
Bash like shells use:

go run file > output 2>&1

2) Set the logger's Output to os.Stdout

Then you run like normal go run file > output and both the logger and fmt go to the same place.

log.SetOutput(os.StdOut)