Reset OS X Account With the Terminal In Single-User Mode

Way 5: Reset Your Admin Password Using the Single-User Mode

1. Access the single-user mode by holding the Command key and S on startup.
2. Type in “mount –uw /” and hit enter.
3. Type in “launchctl load /System/Library/LaunchDaemons/com. ...
4. Type in “passwd [username]” and hit enter.
5. Reset your password.