cut: add gnu compatability to error messages

src/uu/cut/src/cut.rs

@@ -401,8 +401,13 @@ fn cut_files(mut filenames: Vec<String>, mode: Mode) -> i32 {
         } else {
             let path = Path::new(&filename[..]);
 
-            if !path.exists() {
-                show_error!("{}", msg_args_nonexistent_file!(filename));
+            if path.is_dir() {
+                show_error!("{}: Is a directory", filename);
+                continue;
+            }
+
+            if !path.metadata().is_ok() {
+                show_error!("{}: No such file or directory", filename);
                 continue;
             }
 

tests/by-util/test_cut.rs

@@ -139,3 +139,21 @@ fn test_zero_terminated_only_delimited() {
         .succeeds()
         .stdout_only("82\n7\0");
 }
+
+#[test]
+fn test_directory_and_no_such_file() {
+    let (at, mut ucmd) = at_and_ucmd!();
+
+    at.mkdir("some");
+
+    ucmd.arg("-b1")
+        .arg("some")
+        .run()
+        .stderr_is("cut: error: some: Is a directory\n");
+
+    new_ucmd!()
+        .arg("-b1")
+        .arg("some")
+        .run()
+        .stderr_is("cut: error: some: No such file or directory\n");
+}