macOS users can accomplish this by holding down after powering the system. The user may be required to enter a password set in the firmware. In OS X El Capitan and later releases of macOS, the mode can be reversed to single-user mode with the command codice_5 in Terminal, and the system can be fully rebooted in single-user mode with the command codice_6. Single-user mode is different from a safe mode boot in that the system goes directly to the console instead of starting up the core elements of macOS (items in codice_7, ignoring codice_8, codice_9, et al.). From there users are encouraged by a prompt to run fsck or other command line utilities as needed (or installed).