caffeinate: Keep Your Mac Awake with One Terminal Command

![caffeinate: Keep Your Mac Awake with One Terminal Command](/api/v1/images/90946157-853b-4213-8e5c-20f7f4f99932)

## Start quickly

Open Terminal and run:

```bash
caffeinate
```

While this command is running, macOS prevents normal idle sleep. Stop it with `Ctrl+C` in Terminal. After that, your usual Energy settings apply again.

This is useful for large downloads, backups, file transfers, long scripts, or presentations when you do not want to change System Settings just for one task.

## Better variations

For most cases, a targeted version is better than leaving plain `caffeinate` running forever:

```bash
caffeinate -t 3600
```

Keeps the Mac awake for 1 hour. The time is in seconds.

```bash
caffeinate -d
```

Also keeps the display awake. Useful for presentations or watching progress. For downloads, you usually do not need this.

```bash
caffeinate -i make build
```

Keeps the Mac awake while the attached command runs. This is cleaner than remembering to press `Ctrl+C` later.

```bash
caffeinate -w 1234
```

Keeps the Mac awake until the process with ID `1234` exits.

## When to be careful

`caffeinate -d` keeps the screen on. On a MacBook, that costs battery and can be unnecessarily bright. For background jobs, `caffeinate -i` or `caffeinate -t 3600` is often enough.

If you only want to prevent a download from failing, let the display sleep and keep the system awake. That saves power and is usually the right behavior.

## Rule of thumb

Use `caffeinate` when your Mac should stay awake briefly. Use `-t` when you want a fixed duration. Use `-i` with a command when the Mac should stay awake only for that job.