8.2 在Go语言中构建命令行

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package main

import (
    "flag"
    "fmt"
)

func main() {

    wordPtr := flag.String("word", "foo", "a string")

    numbPtr := flag.Int("numb", 42, "an int")
    forkPtr := flag.Bool("fork", false, "a bool")

    var svar string
    flag.StringVar(&svar, "svar", "bar", "a string var")

    flag.Parse()

    fmt.Println("word:", *wordPtr)
    fmt.Println("numb:", *numbPtr)
    fmt.Println("fork:", *forkPtr)
    fmt.Println("svar:", svar)
    fmt.Println("tail:", flag.Args())
}

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go run test_command_line.go --help

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Usage of /tmp/go-build3476798509/b001/exe/test_command_line:
  -fork
    	a bool
  -numb int
    	an int (default 42)
  -svar string
    	a string var (default "bar")
  -word string
    	a string (default "foo")