halt [ -h ] [ -a ] [ -f|F ] [ -m message ] [ -t time ] [ -W ] when
```
This command triggers the halt procedure immediately if *when* is omitted.
The *when* provided **must be** on these formats:
-*now*: triggers the halt sequence immediately. This is the default
-*mins* or *+mins* : relative time; triggers the halt sequence after *mins* minutes.
-*hh:mm* : absolute time; triggers the halt sequence when the time *hh:mm* occurs. If that time has passed for the current day, it will wait for the next day. *hh* can have 1 or 2 digits; *mm***must have** 2 digits.
## Options
-**-h**: print this help.
-**-a**: use access control. The halt sequence will only be launched if one of the users listed in `/etc/66/shutdown.allow` is currently logged in (as tracked by utmp). `/etc/66/shutdown.allow` is a text file which accepts one user per line. Lines starting with # are commented out.
-**-f**: do not trigger a clean shutdown procedure; it will just sync the filesystems then tell the kernel to immediately halt. This should be the last step in the lifetime of the machine.
-**-F**: same as `-f` but do not sync the filesystems.
-**-m***message*: replace the default message by message. message is broadcast to all logged in users (as tracked by utmp).
-**-t***time*: have a grace time period of *time* seconds between the `SIGTERM` and the `SIGKILL` at the end of the halt sequence when it is time to kill all processes (allows processes to receive `SIGTERM` to exit cleanly). The default is `3` seconds.
-**-W**: do not send a wall message to users.
## Usage examples
Halts the system.
```
66 halt
```
Halts a broken system
```
66 halt -f
```
Halts the system after 10 minutes
```
66 halt 10
```
Sends an "system will be halted in 10 minutes" to connected account and halt the system after 10 minutes
```
66 halt -m "system will be halted in 10 minutes" 10
poweroff [ -h ] [ -a ] [ -f|F ] [ -m message ] [ -t time ] [ -W ] when
```
This command triggers the poweroff procedure immediately if *when* is omitted.
The *when* provided **must be** on these formats:
-*now*: triggers the poweroff sequence immediately. This is the default
-*mins* or *+mins* : relative time; triggers the poweroff sequence after *mins* minutes.
-*hh:mm* : absolute time; triggers the poweroff sequence when the time *hh:mm* occurs. If that time has passed for the current day, it will wait for the next day. *hh* can have 1 or 2 digits; *mm***must have** 2 digits.
## Options
-**-h**: print this help.
-**-a**: use access control. The poweroff sequence will only be launched if one of the users listed in `/etc/66/shutdown.allow` is currently logged in (as tracked by utmp). `/etc/66/shutdown.allow` is a text file which accepts one user per line. Lines starting with # are commented out.
-**-f**: do not trigger a clean shutdown procedure; it will just sync the filesystems then tell the kernel to immediately poweroff. This should be the last step in the lifetime of the machine.
-**-F**: same as `-f` but do not sync the filesystems.
-**-m***message*: replace the default message by message. message is broadcast to all logged in users (as tracked by utmp).
-**-t***time*: have a grace time period of *time* seconds between the `SIGTERM` and the `SIGKILL` at the end of the poweroff sequence when it is time to kill all processes (allows processes to receive `SIGTERM` to exit cleanly). The default is `3` seconds.
-**-W**: do not send a wall message to users.
## Usage examples
Shuts down the system.
```
66 poweroff
```
Shuts down a broken system
```
66 poweroff -f
```
Shuts down the system after 10 minutes
```
66 poweroff 10
```
Sends an "system will be shutted down in 10 minutes" to connected account and shuts down the system after 10 minutes
```
66 poweroff -m "system will be shutted down in 10 minutes" 10
reboot [ -h ] [ -a ] [ -f|F ] [ -m message ] [ -t time ] [ -W ] when
```
This command triggers the reboot procedure immediately if *when* is omitted.
The *when* provided **must be** on these formats:
-*now*: triggers the reboot sequence immediately. This is the default
-*mins* or *+mins* : relative time; triggers the reboot sequence after *mins* minutes.
-*hh:mm* : absolute time; triggers the reboot sequence when the time *hh:mm* occurs. If that time has passed for the current day, it will wait for the next day. *hh* can have 1 or 2 digits; *mm***must have** 2 digits.
## Options
-**-h**: print this help.
-**-a**: use access control. The reboot sequence will only be launched if one of the users listed in `/etc/66/shutdown.allow` is currently logged in (as tracked by utmp). `/etc/66/shutdown.allow` is a text file which accepts one user per line. Lines starting with # are commented out.
-**-f**: do not trigger a clean shutdown procedure; it will just sync the filesystems then tell the kernel to immediately reboot. This should be the last step in the lifetime of the machine.
-**-F**: same as `-f` but do not sync the filesystems.
-**-m***message*: replace the default message by message. message is broadcast to all logged in users (as tracked by utmp).
-**-t***time*: have a grace time period of *time* seconds between the `SIGTERM` and the `SIGKILL` at the end of the reboot sequence when it is time to kill all processes (allows processes to receive `SIGTERM` to exit cleanly). The default is `3` seconds.
-**-W**: do not send a wall message to users.
## Usage examples
reboots the system.
```
66 reboot
```
reboots a broken system
```
66 reboot -f
```
reboots the system after 10 minutes
```
66 reboot 10
```
Sends an "system will be rebooted in 10 minutes" to connected account and reboot the system after 10 minutes
```
66 reboot -m "system will be rebooted in 10 minutes" 10
