mv: if more than one of -i, -n, -f, latest "wins"

src/uu/mv/mv.md

@@ -9,6 +9,8 @@ Move `SOURCE` to `DEST`, or multiple `SOURCE`(s) to `DIRECTORY`.
 
 ## After Help
 
+If you specify more than one of `-i`, `-f`, `-n`, only the final one takes effect.
+
 Do not move a non-directory that has an existing destination with the same or newer modification timestamp;
 instead, silently skip the file without failing. If the move is across file system boundaries, the comparison is
 to the source timestamp truncated to the resolutions of the destination file system and of the system calls used

src/uu/mv/src/mv.rs

@@ -145,6 +145,7 @@ pub fn uu_app() -> Command {
                 .short('f')
                 .long(OPT_FORCE)
                 .help("do not prompt before overwriting")
+                .overrides_with_all([OPT_INTERACTIVE, OPT_NO_CLOBBER])
                 .action(ArgAction::SetTrue),
         )
         .arg(
@@ -152,6 +153,7 @@ pub fn uu_app() -> Command {
                 .short('i')
                 .long(OPT_INTERACTIVE)
                 .help("prompt before override")
+                .overrides_with_all([OPT_FORCE, OPT_NO_CLOBBER])
                 .action(ArgAction::SetTrue),
         )
         .arg(
@@ -159,6 +161,7 @@ pub fn uu_app() -> Command {
                 .short('n')
                 .long(OPT_NO_CLOBBER)
                 .help("do not overwrite an existing file")
+                .overrides_with_all([OPT_FORCE, OPT_INTERACTIVE])
                 .action(ArgAction::SetTrue),
         )
         .arg(

tests/by-util/test_mv.rs

@@ -280,6 +280,41 @@ fn test_mv_interactive_dir_to_file_not_affirmative() {
     assert!(at.dir_exists(dir));
 }
 
+#[test]
+fn test_mv_interactive_no_clobber_force_last_arg_wins() {
+    let scene = TestScenario::new(util_name!());
+    let at = &scene.fixtures;
+
+    let file_a = "a.txt";
+    let file_b = "b.txt";
+
+    at.touch(file_a);
+    at.touch(file_b);
+
+    scene
+        .ucmd()
+        .args(&[file_a, file_b, "-f", "-i", "-n"])
+        .fails()
+        .stderr_is(format!("mv: not replacing '{file_b}'\n"));
+
+    scene
+        .ucmd()
+        .args(&[file_a, file_b, "-n", "-f", "-i"])
+        .fails()
+        .stderr_is(format!("mv: overwrite '{file_b}'? "));
+
+    at.write(file_a, "aa");
+
+    scene
+        .ucmd()
+        .args(&[file_a, file_b, "-i", "-n", "-f"])
+        .succeeds()
+        .no_output();
+
+    assert!(!at.file_exists(file_a));
+    assert_eq!("aa", at.read(file_b));
+}
+
 #[test]
 fn test_mv_arg_update_interactive() {
     let (at, mut ucmd) = at_and_ucmd!();