diff --git a/b2/_internal/arg_parser.py b/b2/_internal/arg_parser.py
index c13dc5ba..ed907a47 100644
--- a/b2/_internal/arg_parser.py
+++ b/b2/_internal/arg_parser.py
@@ -54,7 +54,7 @@ def add_argument(self, action):
     def _unique_choice_values(cls, action):
         seen = set()
         seen_add = seen.add
-        for value in action.choices.values():
+        for _, value in sorted(action.choices.items()):
             if not (value in seen or seen_add(value)):
                 yield value
 
@@ -150,6 +150,11 @@ def print_help(self, *args, show_all: bool = False, **kwargs):
             super().print_help(*args, **kwargs)
 
     def format_usage(self):
+        """
+        Format usage message.
+
+        Deduplicate subcommands aliases if they only differ by underscores.
+        """
         # TODO We don't want to list underscore aliases subcommands in the usage.
         # Unfortunately the only way found was to temporarily remove the aliases,
         # print the usage and then restore the aliases since the formatting is deep
@@ -163,10 +168,13 @@ def format_usage(self):
                 if isinstance(action, argparse._SubParsersAction):
                     subparsers_action = action
                     original_choices = action.choices
-                    action.choices = {
-                        key: choice
-                        for key, choice in action.choices.items() if "_" not in key
-                    }
+                    action.choices = {}
+                    choice_values = set()
+                    # sort alphabetically; this also makes `-` come before `_`
+                    for key, choice in sorted(original_choices.items()):
+                        if choice not in choice_values:
+                            action.choices[key] = choice
+                            choice_values.add(choice)
                     # only one subparser supported
                     break
         usage = super().format_usage()
diff --git a/b2/_internal/console_tool.py b/b2/_internal/console_tool.py
index 2d0238c6..e011ebe3 100644
--- a/b2/_internal/console_tool.py
+++ b/b2/_internal/console_tool.py
@@ -3487,7 +3487,7 @@ def execute_operation(self, local_file, bucket, threads, **kwargs):
         return file_version
 
 
-class UploadUnboundStream(UploadFileMixin, Command):
+class UploadUnboundStreamBase(UploadFileMixin, Command):
     """
     Uploads an unbound stream to the given bucket.
 
@@ -5085,6 +5085,11 @@ class UploadFile(CmdReplacedByMixin, FileUploadBase):
     replaced_by_cmd = (File, FileUpload)
 
 
+class UploadUnboundStream(CmdReplacedByMixin, UploadUnboundStreamBase):
+    __doc__ = UploadUnboundStreamBase.__doc__
+    replaced_by_cmd = (File, FileUpload)
+
+
 class DownloadFile(CmdReplacedByMixin, B2URIFileArgMixin, FileDownloadBase):
     __doc__ = FileDownloadBase.__doc__
     replaced_by_cmd = (File, FileDownload)
diff --git a/changelog.d/+sort_help.doc.md b/changelog.d/+sort_help.doc.md
new file mode 100644
index 00000000..d48da79d
--- /dev/null
+++ b/changelog.d/+sort_help.doc.md
@@ -0,0 +1 @@
+Sort subcommands in `--help` alphabetically for better readability.
diff --git a/test/unit/console_tool/test_upload_unbound_stream.py b/test/unit/console_tool/test_upload_unbound_stream.py
index fc00f9ed..ebc6899c 100644
--- a/test/unit/console_tool/test_upload_unbound_stream.py
+++ b/test/unit/console_tool/test_upload_unbound_stream.py
@@ -12,6 +12,8 @@
 
 from b2sdk.v2 import DEFAULT_MIN_PART_SIZE
 
+UUS_DEPRECATION_WARNING = 'WARNING: `upload-unbound-stream` command is deprecated. Use `file upload` instead.\n'
+
 
 @skip_on_windows
 def test_upload_unbound_stream__named_pipe(b2_cli, bucket, tmpdir, bg_executor):
@@ -35,6 +37,7 @@ def test_upload_unbound_stream__named_pipe(b2_cli, bucket, tmpdir, bg_executor):
         expected_json_in_stdout=expected_json,
         remove_version=True,
         expected_part_of_stdout=expected_stdout,
+        expected_stderr=UUS_DEPRECATION_WARNING,
     )
     writer.result(timeout=1)
 
@@ -59,6 +62,7 @@ def test_upload_unbound_stream__stdin(b2_cli, bucket, tmpdir, mock_stdin):
         expected_json_in_stdout=expected_json,
         remove_version=True,
         expected_part_of_stdout=expected_stdout,
+        expected_stderr=UUS_DEPRECATION_WARNING,
     )
 
 
@@ -99,6 +103,7 @@ def test_upload_unbound_stream__with_part_size_options(
         expected_json_in_stdout=expected_json,
         remove_version=True,
         expected_part_of_stdout=expected_stdout,
+        expected_stderr=UUS_DEPRECATION_WARNING,
     )
     writer.result(timeout=1)
 
@@ -124,6 +129,6 @@ def test_upload_unbound_stream__regular_file(b2_cli, bucket, tmpdir):
         expected_json_in_stdout=expected_json,
         remove_version=True,
         expected_part_of_stdout=expected_stdout,
-        expected_stderr=
+        expected_stderr=f"{UUS_DEPRECATION_WARNING}"
         "WARNING: You are using a stream upload command to upload a regular file. While it will work, it is inefficient. Use of `file upload` command is recommended.\n",
     )