Optional/Obrigatory parameters

claptest/Cargo.lock

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claptest/Cargo.toml

@@ -0,0 +1,9 @@
+[package]
+name = "claptest"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+clap = { version = "3.1.8", features = ["derive", "env"] }

claptest/src/main.rs

@@ -0,0 +1,16 @@
+use clap::Parser;
+
+#[derive(Parser)]
+struct Params {
+    /// String opcional
+    #[clap(long)]
+    opt: Option<String>,
+
+    /// String obrigatória
+    #[clap(long)]
+    obr: String,
+}
+
+fn main() {
+    let _args = Params::parse();
+}