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flags.go
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flags.go
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package main
import "flag"
import "fmt"
import "os"
func main() {
fmt.Println("--- flag ---")
var port int
var hostPtr = flag.String("host", "localhost", "database host")
flag.IntVar(&port, "port", 5432, "database port")
flag.Parse()
fmt.Printf("host = %s\n", *hostPtr)
fmt.Printf("port = %d\n", port)
fmt.Println("all args:", os.Args)
fmt.Println("remaining args:", flag.Args())
fmt.Printf("remaining args: %v\n", flag.Args())
fmt.Println()
}
func usage() {
fmt.Println("--- usage ---")
fmt.Fprintf(os.Stderr, "usage: %s [-bloviate <string>] [-port <int>]\n", os.Args[0])
flag.PrintDefaults()
os.Exit(2)
}