clap/examples/tutorial_builder/03_05_default_values.rs

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use clap::{app_from_crate, arg};
fn main() {
let matches = app_from_crate!()
.arg(arg!([NAME]).default_value("alice"))
.get_matches();
println!(
"NAME: {:?}",
matches
.value_of("NAME")
.expect("default ensures there is always a value")
);
}