How to restart Linux Ubuntu from command line. Learn to use shutdown command to restart Ubuntu from terminal command line. Ubuntu restart command or shutdown Ubuntu command or Ubuntu shutdown timer command can be used to perform different tasks.
Command 1 – reboot
The reboot command can be used to halt, poweroff or reboot the machine. The different reboot command options are:
- –halt : Halt the machine, regardless of which one of the three commands is invoked.
- -p, –poweroff : Power-off the machine, regardless of which one of the three commands is invoked.
- –reboot : Reboot the machine, regardless of which one of the three commands is invoked.
- -f, –force : Force immediate halt, power-off, reboot. Do not contact the init system.
- –no-wall : Do not send wall message before halt, power-off, reboot.
Command 2 – shutdown
The shutdown command can be used to halt, poweroff or reboot the machine. The first argument may be a time string (which is usually “now”). Optionally, this may be followed by a wall message to be sent to all logged-in users before going down.
The time string may either be in the format “hh:mm” for hour/minutes specifying the time to execute the shutdown at, specified in 24h clock format. Alternatively it may be in the syntax “+m” referring to the specified number of minutes m from now. “now” is an alias for “+0”, i.e. for triggering an immediate shutdown. If no time argument is specified, “+1” is implied. Note that to specify a wall message you must specify a time argument, too.
If the time argument is used, 5 minutes before the system goes down the /run/nologin file is created to ensure that further logins shall not be allowed.
The different shutdown command options are:
- -H, –halt : Halt the machine.
- -P, –poweroff : Power-off the machine (the default).
- -r, –reboot : Reboot the machine.
- -c : Cancel a pending shutdown. This may be used cancel the effect of an invocation of shutdown with a time argument that is not “+0” or “now”.
For example to shutdown after 10 minutes:
$ sudo shutdown -r 10
Command 2 – halt
The halt command can be used to halt, poweroff, reboot may be used to halt, power-off or reboot the machine. The halt command has the following options:
- –halt : Halt the machine, regardless of which one of the three commands is invoked.
- -p, –poweroff : Power-off the machine, regardless of which one of the three commands is invoked.
- –reboot : Reboot the machine, regardless of which one of the three commands is invoked.
- -f, –force : Force immediate halt, power-off, reboot. Do not contact the init system.
- –no-wall : Do not send wall message before halt, power-off, reboot.
Please be cautious before using any of the commands via Terminal.