To install:
```bash
sudo apt install ydotool
```

This is from Gemini.

To ensure `ydotoold` automatically starts and is available system-wide without requiring `sudo` or manual intervention, the cleanest approach on modern Linux (Wayland/X11) is to set up `ydotoold` as a **systemd user service** and give your user access to the `/dev/uinput` device via a **udev rule**.

Here is the complete step-by-step procedure:

---

### Step 1: Grant Your User Access to `/dev/uinput`

By default, `/dev/uinput` requires root permissions. Setting up a `udev` rule lets your user interact with the virtual input subsystem safely without `sudo`.

#### 1. Create the `input` group (if it doesn't already exist):
```bash
sudo groupadd -f input

```


#### 2. Add your user to the `input` group:
```bash
sudo usermod -aG input $USER

```


#### 3. Create a udev rule for uinput:
Create `/etc/udev/rules.d/80-uinput.rules`:
```bash
echo 'KERNEL=="uinput", GROUP="input", MODE="0660"' | sudo tee /etc/udev/rules.d/80-uinput.rules

```


#### 4. Reload udev rules:
```bash
sudo udevadm control --reload-rules && sudo udevadm trigger

```

*(Note: You will need to **log out and log back in** or run `newgrp input` for the group changes to take effect).*

---

### Step 2: Create a Systemd User Service

#### 1. Create the user systemd directory:
```bash
mkdir -p ~/.config/systemd/user/

```


#### 2. Create the service unit file:
Save the following as `~/.config/systemd/user/ydotoold.service`:
```ini
[Unit]
Description=ydotool daemon
Documentation=man:ydotoold(8)

[Service]
Type=simple
ExecStart=/usr/bin/ydotoold
Restart=on-failure
RestartSec=2s

[Install]
WantedBy=default.target

```


*(If your `ydotoold` binary is in `/usr/local/bin/ydotoold`, update the `ExecStart` path accordingly by checking with `which ydotoold`).*

---

### Step 3: Enable and Start the Service

#### 1. Reload systemd user daemon:
```bash
systemctl --user daemon-reload

```


#### 2. Enable and start `ydotoold` immediately:
```bash
systemctl --user enable --now ydotoold

```


#### 3. Verify the service status:
```bash
systemctl --user status ydotoold

```


You should see `active (running)`.

---

### Step 4: Add Socket Environment Variable (Optional / Troubleshooting)

If `ydotool` complains about not finding `/tmp/ydotool_socket` or permission errors, add the default socket path to your environment:

Add this to your `~/.bashrc`, `~/.zshrc`, or shell configuration profile:

```bash
export YDOTOOL_SOCKET="/tmp/ydotool_socket"

```

---

### Verification

Test that `ydotool` works without `sudo` or any background terminal:

```bash
ydotool key 57:1 57:0   # Sends Spacebar press/release

```

Now `ydotoold` will automatically launch in the background as your user whenever you boot into your desktop session.