Objective: The `upgrade` function is designed to trigger a system upgrade process by invoking an external shell script from within the application.

• Name: `upgrade`
• Parameters: `update`, `context`
• Return Type: `None`

def upgrade(update: Update, context: CallbackContext) -> None:
    update.message.reply_text("llamando al actualizador... en unos 30 o 40 segundos tendría que volver \nEs útil dejar un comando /ping pendiente")
    process = subprocess.run(["/home/facundo/bot/masterpull.sh"],shell=True)

1. Reply to User:

1. Upon receiving the command, send a reply to the user indicating that the system upgrade process is being initiated. Provide an estimated time for completion and suggest leaving a pending `/ping` command for monitoring.

2. Executing Shell Script:

1. Utilize the `subprocess.run()` method to execute a shell command from within the Python code.
2. Pass the path to the shell script (`masterpull.sh`) as a list argument to the `run()` method.
3. Set the `shell` parameter to `True` to execute the command using the system shell.

3. Upgrade Process Execution:

1. The invoked shell script (`masterpull.sh`) likely contains commands and procedures for updating the system components, installing patches, or performing other upgrade tasks.
2. The execution of the shell script is asynchronous, meaning the function continues to run without waiting for the script's completion.

4. User Notification:

1. Once the system upgrade process is initiated, the function returns without further interaction or confirmation. Users are left with the information provided in the initial reply.

The `upgrade` function demonstrates the capability to initiate system upgrade processes directly from the application by invoking external shell scripts. This functionality provides users with a convenient way to trigger system maintenance tasks or perform upgrades without leaving the messaging platform. However, it's essential to exercise caution and ensure the scripts being executed are secure and perform the intended actions without adverse effects on the system.