Add Terminal Notifications for Long-Running Commands example

Signed-off-by: Sharjeel Aziz <sharjeel.aziz@gmail.com>

docs/examples.md

@@ -634,3 +634,62 @@ or by simply providing traccar with a valid username/password combination.
         <entry key='sms.http.user'>phil</entry>
         <entry key='sms.http.password'>mypass</entry>
 ```
+
+## Terminal Notifications for Long-Running Commands
+
+This example provides a simple way to send notifications using [ntfy.sh](https://ntfy.sh) when a terminal command completes. It includes success or failure indicators based on the command's exit status.
+
+### Setup
+
+1. Store your ntfy.sh bearer token securely if access control is enabled:
+
+   ```sh
+   echo "your_bearer_token_here" > ~/.ntfy_token
+   chmod 600 ~/.ntfy_token
+   ```
+
+1. Add the following function and alias to your `.bashrc` or `.bash_profile`:
+
+    ```sh
+    # Function for alert notifications using ntfy.sh
+    notify_via_ntfy() {
+    local exit_status=$?  # Capture the exit status before doing anything else
+    local token=$(< ~/.ntfy_token)  # Securely read the token
+    local status_icon="$([ $exit_status -eq 0 ] && echo magic_wand || echo warning)"
+    local last_command=$(history | tail -n1 | sed -e 's/^[[:space:]]*[0-9]\{1,\}[[:space:]]*//' -e 's/[;&|][[:space:]]*alert$//')
+
+    curl -s -X POST "https://n.example.dev/alerts" \
+        -H "Authorization: Bearer $token" \
+        -H "Title: Terminal" \
+        -H "X-Priority: 3" \
+        -H "Tags: $status_icon" \
+        -d "Command: $last_command (Exit: $exit_status)"
+
+    echo "Tags: $status_icon"
+    echo "$last_command (Exit: $exit_status)"
+    }
+
+    # Add an "alert" alias for long running commands using ntfy.sh
+    alias alert='notify_via_ntfy'
+
+    ```
+
+### Usage
+
+Run any long-running command and append `alert` to notify when it completes:
+
+```sh
+sleep 10; alert
+```
+![ntfy notifications on mobile device](static/img/mobile-screenshot-notification.png)
+
+**Notification Sent** with a success 🪄 (`magic_wand`) or failure ⚠️ (`warning`) tag.
+
+#### Simulating Failures
+
+To test failure notifications:
+
+```sh
+false; alert  # Always fails (exit 1)
+ls --invalid; alert  # Invalid option
+cat nonexistent_file; alert  # File not found