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| Chapter 2 UNIX Commands |

## shutdown

    /usr/sbin/shutdown [options]

Allow a privileged user to change system state. Default behavior is to terminate user processes, taking system down from multi-user state (state 2) to single-user state. That is, only the system console provides access. shutdown sends a warning message, waits 60 seconds, sends a final message, waits another 60 seconds, and finally prompts for confirmation. shutdown is the SVR4 alternative to halt or reboot.

### Options

-g`n`

  Use a grace-period of `n` seconds instead of 60.

-i`k`

  Tell the init command to place system in state `k`:

  s

    Single-user state (the default).

  0

    Shutdown for safe power-off.

  1

    Like s, but mount multi-user file systems.

  5

    Stop system; go to firmware mode.

  6

    Stop system and then reboot.

-y

  Suppress the default prompt for confirmation.

Reference: shl |  | Reference: size