命令行参数个数
调用 os 包即可。
获取参数个数, 遍历参数
package mainimport ( "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// 输入如下 /** 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 mainimport ( "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// 输入如下 /** -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// 输入如下 /** -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*/