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macOS User Guide
- Welcome
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- Use Continuity across your devices
- Use your iPad as a second display
- Hand off between devices
- Insert photos and scans from iPhone or iPad
- Insert sketches from iPhone or iPad
- Copy and paste between devices
- Use Apple Watch to unlock your Mac and approve requests
- Make and receive phone calls on your Mac
- Control accessories in your home
- Send files between devices with AirDrop
- Use AirPods with your Mac
- Stream content to Apple TV
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- Understand passwords
- Use keychains to store passwords
- Reset your Mac login password
- Set up your Mac to be secure
- Guard your privacy
- Protect your Mac from malware
- Use Sign in with Apple for apps and websites
- Clear your Safari browsing history
- Manage cookies and other website data in Safari
- Find a missing device
- Resources for your Mac
- Resources for your Apple devices
Start up your Mac in single-user mode
To troubleshoot your computer’s startup sequence using only UNIX commands, start up in single-user mode. You should do this only if you’re comfortable with UNIX.
On your Mac, choose Apple menu
> Restart, or press the power button if your Mac is turned off.Press Command-S as your Mac starts up.
The screen is black with standard white text. You can now run the UNIX commands that you want.
In single-user mode, not all macOS functions are available. To use the standard macOS interface or other high-level aspects of macOS, you need to start up in the standard mode.
To switch back to the standard macOS interface, type reboot, then press Return.
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