ls: support multiple -a or -A

src/uu/ls/src/ls.rs

@@ -1204,6 +1204,7 @@ pub fn uu_app<'a>() -> Command<'a> {
                 .long(options::files::ALL)
                 // Overrides -A (as the order matters)
                 .overrides_with(options::files::ALMOST_ALL)
+                .multiple_occurrences(true)
                 .help("Do not ignore hidden files (files with names that start with '.')."),
         )
         .arg(
@@ -1212,6 +1213,7 @@ pub fn uu_app<'a>() -> Command<'a> {
                 .long(options::files::ALMOST_ALL)
                 // Overrides -a (as the order matters)
                 .overrides_with(options::files::ALL)
+                .multiple_occurrences(true)
                 .help(
                     "In a directory, do not ignore all file names that start with '.', \
 only ignore '.' and '..'.",

tests/by-util/test_ls.rs

@@ -2891,3 +2891,25 @@ fn test_ls_a_A() {
         .stdout_does_not_contain(".")
         .stdout_does_not_contain("..");
 }
+
+#[test]
+#[allow(non_snake_case)]
+fn test_ls_multiple_a_A() {
+    let scene = TestScenario::new(util_name!());
+
+    scene
+        .ucmd()
+        .arg("-a")
+        .arg("-a")
+        .succeeds()
+        .stdout_contains(".")
+        .stdout_contains("..");
+
+    scene
+        .ucmd()
+        .arg("-A")
+        .arg("-A")
+        .succeeds()
+        .stdout_does_not_contain(".")
+        .stdout_does_not_contain("..");
+}