Golang flag.FlagSet.DurationVar() function example

package flag

DurationVar defines a time.Duration flag with specified name(2nd parameter), default value(3rd parameter), and usage string(4th parameter). The argument p(1st parameter) points to a time.Duration variable in which to store the value of the flag.

Golang flag.FlagSet.DurationVar() function usage example

 package main

 import (
 "flag"
 "fmt"
 "time"
 )

 func main() {

 flagSet := flag.NewFlagSet("check", flag.ExitOnError)

 var p time.Duration

 flagSet.DurationVar(&p, "timeout", 2*time.Second, "Disk query process time out")

 flag.Parse()

 fmt.Println(p)

 }

Output :

2s

Reference :

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