Fix initialization.py example so it uses a valid startup script and delete redundant alias_startup.py example

Author: tleonhardt

docs/features/startup_commands.md

@@ -47,8 +47,8 @@ class StartupApp(cmd2.Cmd):
 ```
 
 This text file should contain a [Command Script](./scripting.md#command-scripts). See the
-[AliasStartup](https://github.com/python-cmd2/cmd2/blob/main/examples/alias_startup.py) example for
-a demonstration.
+[initialization](https://github.com/python-cmd2/cmd2/blob/main/examples/initialization.py) example
+for a demonstration.
 
 You can silence a startup script's output by setting `silence_startup_script` to True:
 

examples/README.md

@@ -11,9 +11,6 @@ application, if you are looking for that then see
 Here is the list of examples in alphabetical order by filename along with a brief description of
 each:
 
-- [alias_startup.py](https://github.com/python-cmd2/cmd2/blob/main/examples/alias_startup.py)
-    - Demonstrates how to add custom command aliases and how to run an initialization script at
-      startup
 - [arg_decorators.py](https://github.com/python-cmd2/cmd2/blob/main/examples/arg_decorators.py)
     - Demonstrates how to use the `cmd2.with_argparser` decorator to specify command arguments using
       [argparse](https://docs.python.org/3/library/argparse.html)
@@ -62,7 +59,7 @@ each:
 - [hooks.py](https://github.com/python-cmd2/cmd2/blob/main/examples/hooks.py)
     - Shows how to use various `cmd2` application lifecycle hooks
 - [initialization.py](https://github.com/python-cmd2/cmd2/blob/main/examples/initialization.py)
-    - Shows how to colorize output, use multiline command, add persistent history, and more
+    - Shows how to colorize output, use multiline command, add persistent history, and much more
 - [migrating.py](https://github.com/python-cmd2/cmd2/blob/main/examples/migrating.py)
     - A simple `cmd` application that you can migrate to `cmd2` by changing one line
 - [modular_commands_basic.py](https://github.com/python-cmd2/cmd2/blob/main/examples/modular_commands_basic.py)

examples/alias_startup.py

@@ -12,6 +12,8 @@
 10) How to make custom attributes settable at runtime.
 """
 
+import pathlib
+
 from rich.style import Style
 
 import cmd2
@@ -25,10 +27,13 @@ class BasicApp(cmd2.Cmd):
     CUSTOM_CATEGORY = 'My Custom Commands'
 
     def __init__(self) -> None:
+        # Startup script that defines a couple aliases for running shell commands
+        alias_script = pathlib.Path(__file__).absolute().parent / '.cmd2rc'
+
         super().__init__(
             multiline_commands=['echo'],
             persistent_history_file='cmd2_history.dat',
-            startup_script='scripts/startup.txt',
+            startup_script=alias_script,
             include_ipy=True,
         )