Go Package log: Difference between revisions
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==Changing the Logging Device== | ==Changing the Logging Device== | ||
By default, the logger is set to write to < | By default, the logger is set to write to <code>stderr</code>. To change that, execute <code>log.SetOutput()</code> from the <code>[[Go_Functions#init.28.29|init()]]</code> function, or at least before using the logging system. | ||
===Log to <tt>stdout</tt>=== | ===Log to <tt>stdout</tt>=== |
Revision as of 01:30, 19 December 2023
External
Internal
Overview
The "log" package provides support for logging messages to stdout, stderr or custom devices.
import (
"log"
)
...
log.Printf("something %s\n", "else")
Elements
- log.Fatal: Fatal is equivalent to Print() followed by a call to os.Exit(1).
Recipes
Changing the Logging Device
By default, the logger is set to write to stderr
. To change that, execute log.SetOutput()
from the init()
function, or at least before using the logging system.
Log to stdout
import (
"log"
"os"
)
...
func init() {
// change the device for logging to stdout
log.SetOutput(os.Stdout)
}
Log to a File
import (
"log"
"os"
)
...
func init() {
// change the device for logging to a custom file
fileName := "/tmp/somefile.log"
f, err := os.Create(fileName)
if err != nil {
fmt.Printf("failed to open log file %s for writing\n", fileName)
...
} else {
log.SetOutput(f)
}
}