One tap, and your computer wakes up.

Linux

You are allowing your user account to run the shutdown command without being asked. Everything below happens on the target computer itself — not on your iPhone.

1. Open a terminal. Usually via your app overview, searching for “Terminal”.
2. Type sudo visudo and press Enter. It asks for your password — nothing appears on screen while you type, which is normal. Press Enter.
3. Use the arrow keys to move to the very bottom and add this line. Replace frank with your username:

frank ALL=(ALL) NOPASSWD: /usr/bin/shutdown, /usr/bin/systemctl

4. Save and close. If the bottom line says “^O Write Out”, you are in nano: Ctrl+O, Enter, then Ctrl+X. If the screen looks bare, it is vi: press Esc, type :wq, press Enter.
5. In MagicPing, set this as the computer’s command:

sudo shutdown -h now

Windows

Windows can accept remote commands but ships with the feature switched off. You turn it on — no terminal typing needed here.

1. Settings → System → Optional features. Click “Add an optional feature”, search for OpenSSH Server and install it.
2. Start the service: Windows+R, type services.msc, Enter. Double-click “OpenSSH SSH Server”, set the startup type to Automatic and click Start.
3. Your Windows user must be an administrator (Settings → Accounts). Without that, Windows answers with “Access denied”.
4. In MagicPing, set this as the computer’s command:

shutdown /s /t 0

Mac

Two steps: turn on remote access, then allow shutting down.

1. Open System Settings → General → Sharing and turn on Remote Login.
2. Open Terminal: ⌘+Space, type “Terminal”, press Enter.
3. Type sudo visudo, Enter, then your password (the input stays invisible), Enter. Move to the very bottom and add this — with your username instead of frank:

frank ALL=(ALL) NOPASSWD: /sbin/shutdown

4. Save: On a Mac this is the vi editor — press Esc, type :wq, press Enter.
5. In MagicPing, set this as the computer’s command:

sudo shutdown -h now