Go快速入门指南命令行参数

命令行参数个数

调用 os 包即可。

获取参数个数, 遍历参数

package main
import (
"fmt"
"os"
)
func main() {
fmt.Printf("Number of args is %d\n\n", len(os.Args))
for _, arg := range os.Args {
fmt.Println(arg)
}
}
// $ go build main.go
// $ ./main -a -b --c -d
// 输出如下
/**
Number of args is 5
./main
-a
-b
--c
-d
*/
命令行参数解析和设置

调用 flag 包即可。

例子

设置参数

package main
import (
"flag"
"fmt"
)
var (
name = flag.String("name", "Tom", "Please input your name:") // 默认值 Tom
age = flag.Int("age", 6, "Please input your age:") // 默认值 6
hasMoney = flag.Bool("hasMoney", true, "Do you have any money?") // 默认值 true
)
func main() {
flag.PrintDefaults() // 打印参数提示信息
flag.Parse()
fmt.Printf("name is %s\n", *name)
fmt.Printf("name is %d\n", *age)
fmt.Printf("name is %t\n", *hasMoney)
}
// 默认参数
// $ go run main.go
// 输出如下
/**
-age int
Please input your age: (default 6)
-hasMoney
Do you have any money? (default true)
-name string
Please input your name: (default "Tom")
name is Tom
name is 6
name is true
*/
// 设置参数
// $ go run main.go -name=Jerry -age=8 -hasMOney=false
// 输出如下
/**
-age int
Please input your age: (default 6)
-hasMoney
Do you have any money? (default true)
-name string
Please input your name: (default "Tom")
name is Jerry
name is 8
name is false
*/
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