package main import ( "os" "github.com/urfave/cli/v2" ) func main() { app := &cli.App{ Name: "SSL Certificate Checker", Usage: "check SSL certificates at once", Flags: []cli.Flag{ &cli.StringFlag{ Name: "config", Aliases: []string{"C"}, Value: "", Usage: "config file", Required: true, }, }, Action: func(c *cli.Context) error { prettyPrintCertsInfo(c.String("config")) return nil }, } err := app.Run(os.Args) if err != nil { os.Exit(1) } }