Create how_to_schedule.md

how_to_schedule.md

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+# How to schedule a script in Synology Task Manager
+
+To schedule a script to run on your Synology at boot-up or shut-down follow these steps:
+
+**Note:** You can setup a schedule task and leave it disabled, so it only runs when you select the task in the Task Scheduler and click on the Run button.
+
+1. Go to **Control Panel** > **Task Scheduler** > click **Create** > and select **Triggered Task**.
+2. Select **User-defined script**.
+3. Enter a task name.
+4. Select **root** as the user (The script needs to run as root).
+5. Select **Boot-up** as the event that triggers the task.
+6. Leave **Enable** ticked.
+7. Click **Task Settings**.
+8. Optionally you can tick **Send run details by email** and **Send run details only when the script terminates abnormally** then enter your email address.
+9. In the box under **User-defined script** type the path to the script. 
+    - e.g. If you saved the script to a shared folder on volume1 called "scripts" you'd type: **/volume1/scripts/syno_hdd_db.sh**
+11. Click **OK** to save the settings.
+