:bug: Remove `ls` from list of system commands to warn about

IPython/core/interactiveshell.py

@@ -2414,14 +2414,9 b' class InteractiveShell(SingletonConfigurable):'
         cmd = self.var_expand(cmd, depth=1)
         # warn if there is an IPython magic alternative.
         main_cmd = cmd.split()[0]
-        has_magic_alternatives = ("pip", "conda", "cd", "ls")
+        has_magic_alternatives = ("pip", "conda", "cd")
 
-        # had to check if the command was an alias expanded because of `ls`
-        is_alias_expanded = self.alias_manager.is_alias(main_cmd) and (
-            self.alias_manager.retrieve_alias(main_cmd).strip() == cmd.strip()
-        )
-
-        if main_cmd in has_magic_alternatives and not is_alias_expanded:
+        if main_cmd in has_magic_alternatives:
             warnings.warn(
                 (
                     "You executed the system command !{0} which may not work "

IPython/core/tests/test_interactiveshell.py

@@ -623,7 +623,7 b' class TestSystemRaw(ExitCodeChecks):'
         self.assertEqual(ip.user_ns["_exit_code"], -signal.SIGINT)
 
     def test_magic_warnings(self):
-        for magic_cmd in ("ls", "pip", "conda", "cd"):
+        for magic_cmd in ("pip", "conda", "cd"):
             with self.assertWarnsRegex(Warning, "You executed the system command"):
                 ip.system_raw(magic_cmd)