how to save fmt.Print and log.Print into same file in Golang

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?

Possible duplicate of How can I redirect and append both stdout and stderr to a file with Bash? — Ainar-G
– Ainar-G, Commented Dec 15, 2015 at 16:21

David Budworth · Accepted Answer · 2015-12-16 17:22:26Z

6

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)

edited Dec 16, 2015 at 17:22

answered Dec 15, 2015 at 16:29

David Budworth

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