src/error.rs

@@ -1,7 +1,14 @@
 use std::env;
+use std::path::Path;
 
 fn error(message: &str) {
-    eprintln!("{}: {}", env::args().next().unwrap(), message);
+    let argv0: String = env::args().next().unwrap();
+    let program_name = Path::new(&argv0)
+        .file_name()
+        .unwrap()
+        .to_str()
+        .unwrap();
+    eprintln!("{}: {}", program_name, message);
 }
 
 pub fn command_not_found(command: &String) -> i32 {