use clap::Command; fn main() { let cmd = Command::new(env!("CARGO_CRATE_NAME")) .multicall(true) .arg_required_else_help(true) .subcommand_value_name("APPLET") .subcommand_help_heading("APPLETS") .subcommand(Command::new("hostname").about("show hostname part of FQDN")) .subcommand(Command::new("dnsdomainname").about("show domain name part of FQDN")); match cmd.get_matches().subcommand_name() { Some("hostname") => println!("www"), Some("dnsdomainname") => println!("example.com"), _ => unreachable!("parser should ensure only valid subcommand names are used"), } }