It is important to mention that when specifying a custom wall message you must specify a time argument too. The following command will shut down the system in 10 minutes from now and notify the users with message “System upgrade”: To shutdown your system immediately you can use +0 or its alias now: The following example will schedule a system shutdown in 20 minutes from now: The following example will schedule a system shutdown at 05 A.M: It can be an absolute time in the format hh:mm and relative time in the format +m where m is the number of minutes from now. The time argument can have two different formats. How to shutdown the system at a specified time In it’s simplest form when used without any argument, shutdown will power off the machine. k : Only send out the warning messages and disable logins, do not actually bring the system down. TIME is not specified with this option, the first argument is MESSAGE. P : Requests that the system be powered off after it has been brought down. H : Requests that the system be halted after it has been brought down. h : Requests that the system be either halted or powered off after it has been brought down, with the choice as to which left up to the system. r : Requests that the system be rebooted after it has been brought down. message – The message argument specifies a message which will be broadcast to all users.time – The time argument specifies when to perform the shutdown process.options – Shutdown options such as halt, power-off (the default option) or reboot the system.Only root user can execute shutdown command. When the shutdown is initiated, all logged-in users and processes are notified that the system is going down, and no further logins are allowed. You can shutdown the machine immediately, or schedule a shutdown using 24 hour format.It brings the system down in a secure way. The shutdown command in Linux is used to shutdown the system in a safe way. How to Hack WPA/WPA2 WiFi Using Kali Linux?.Mutex lock for Linux Thread Synchronization.SORT command in Linux/Unix with examples. AWK command in Unix/Linux with examples.Sed Command in Linux/Unix with examples.ISRO CS Syllabus for Scientist/Engineer Exam.ISRO CS Original Papers and Official Keys.GATE CS Original Papers and Official Keys.
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