Golang flag.FlagSet.PrintDefaults() function example

package flag

PrintDefaults prints, to standard error unless configured otherwise, the default values of all defined flags in the set.

Golang flag.FlagSet.PrintDefaults() function usage example

 package main

 import (
 "flag"
 "fmt"
 )

 var flagSet *flag.FlagSet

 func main() {

 flagSet = flag.NewFlagSet("example", flag.ContinueOnError)

 flagSet.String("file", "", "filename to view")

 flagSet.Int("timeout", 5000, "specify the time in milliseconds to wait for a response")

 err := flagSet.Parse([]string{"file", "timeout"})

 if err != nil {
 fmt.Println(err)
 }

 flagSet.PrintDefaults()
 }

Output :

-file="": filename to view

-timeout=5000: specify the time in milliseconds to wait for a response

Reference :

http://golang.org/pkg/flag/#FlagSet.PrintDefaults