diff --git a/src/main.rs b/src/main.rs
index 54704f7..1852fb6 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -8,6 +8,8 @@
 mod cli;
 mod utils;
 
+use std::env::args_os;
+
 use bumpalo::Bump;
 use clap::Parser as _;
 use color_eyre::Result;
@@ -20,14 +22,19 @@ use crate::{
 
 fn main() {
     if let Err(e) = ensure_consistent_panic(uu_main) {
-        exit_err(e)
+        exit_err(Some(e))
     }
 }
 
 #[tracing::instrument]
 fn uu_main() -> Result<()> {
-    let args = Args::parse();
-    println!("{args:?}");
+    let args = match Args::try_parse_from(args_os()) {
+        Ok(args) => args,
+        Err(msg) => {
+            msg.print()?;
+            exit_err(Option::<&str>::None)
+        }
+    };
 
     let arena = Bump::with_capacity(4000); // 4KB minus metadata-ish
     let mut parser = Parser::new(&arena);
@@ -38,7 +45,7 @@ fn uu_main() -> Result<()> {
             return Ok(());
         }
     };
-    println!("{ast}");
+    println!("---\n{ast}");
     dbg!(arena.chunk_capacity());
 
     // for token in lex {
diff --git a/src/utils.rs b/src/utils.rs
index cada99c..721aa95 100644
--- a/src/utils.rs
+++ b/src/utils.rs
@@ -65,13 +65,15 @@ pub fn exit_with(res: Result<Option<impl Into<ExitCode>>, impl Display + Debug>)
     let code = match res {
         Ok(Some(x)) => x.into(),
         Ok(None) => EXIT_SUCCESS,
-        Err(e) => exit_err(e),
+        Err(e) => exit_err(Some(e)),
     };
 
     exit(code)
 }
 
-pub fn exit_err(err: impl Display + Debug) -> ! {
-    eprintln!("{err:?}");
+pub fn exit_err(err: Option<impl Display + Debug>) -> ! {
+    if let Some(err) = err {
+        eprintln!("{err}");
+    }
     exit(EXIT_FAILURE)
 }
diff --git a/tests/awk.rs b/tests/awk.rs
index 6521147..e3fb16c 100644
--- a/tests/awk.rs
+++ b/tests/awk.rs
@@ -1,5 +1,7 @@
 use std::env;
 
+use uutests::util::TestScenario;
+
 pub const TESTS_BINARY: &str = env!("CARGO_BIN_EXE_awk");
 
 #[ctor::ctor]
@@ -12,5 +14,9 @@ fn init() {
     }
 }
 
+fn ucmd() -> uutests::util::UCommand {
+    TestScenario::new("awk").cmd(TESTS_BINARY)
+}
+
 #[path = "by-util/test_awk.rs"]
 mod test_awk;
diff --git a/tests/by-util/test_awk.rs b/tests/by-util/test_awk.rs
index 0b34e9f..5ff71e2 100644
--- a/tests/by-util/test_awk.rs
+++ b/tests/by-util/test_awk.rs
@@ -1,12 +1,16 @@
-use uutests::new_ucmd;
+use crate::ucmd;
 
 #[test]
 fn empty_program_succeeds() {
-    new_ucmd!().arg("").succeeds();
+    ucmd().arg("").succeeds();
 }
 
 #[test]
-#[ignore = "parser does not yet support print/field expressions"]
 fn print_first_field() {
-    new_ucmd!().arg("{ print $1 }").succeeds();
+    ucmd().args(&["{ print $1 }"]).succeeds();
+}
+
+#[test]
+fn no_args_fails_code_one() {
+    ucmd().fails_with_code(1);
 }