PsShutdown (PsTools)

Initiate a shutdown/reboot of a local or remote computer, logoff a user, lock a system.

Syntax
      psshutdown [[\\computer[,computer[,..] | @file [-u user [-p passwd]]]
         -s|-r|-h|-d|-k|-a|-l|-o 
            [-f] [-c] [-t nn|h:m] [-n s] [-v nn]
               [-e [u|p]:xx:yy] [-m "message"]
Options:

   computer   The computer on which the user account resides. Default=local system 
              a wildcard (\\*), will affect all computers in the current domain.

   -p passwd  Specify a password for user (optional). Passed as clear text.
              If omitted, you will be prompted to enter a hidden password.

   -u user    Specify a user name for login to remote computer(optional).

   @file      Execute the command on each of the computers listed in the file.

   -a         Abort a shutdown (only possible while a countdown is in progress)

   -c         Allow the shutdown to be aborted by the interactive user

   -d         Suspend the computer

  -e [u|p]:xx:yy 
              Shutdown reason code, 'u' = user, 'p'= planned shutdown.
              xx is the major reason code (must be less than 256)
              yy is the minor reason code (must be less than 65536)

   -f         Force all running applications to exit during the shutdown
              instead of giving them a chance to gracefully save their data.

   -h         Hibernate the computer

   -k         Poweroff the computer (reboot if poweroff is not supported)

   -l         Lock the computer

  -m "message" Specify a message to logged-on users when a shutdown countdown commences

   -n         Timeout in seconds connecting to remote computers

   -o         Logoff the console user

   -r         Reboot after shutdown

   -s         Shutdown without poweroff

   -t         Countdown in seconds until the shutdown (default: 20 seconds)
              or the time of shutdown (in 24 hour notation)

   -v         Display message for the specified number of seconds before the shutdown. 
              default= display a shutdown notification dialog,
              specifying a value of 0 results in no dialog.

   -          Help, display the supported options.

This tool allows administrators to create a batch file that will run against multiple computers to perform a mass change of the administrator password.

Examples:

Reboot \\workstation64 as part of an OS upgrade

psshutdown \\workstation64 -r -e p:2:3

“I shall go the way of the open sea, To the lands I knew before you came,
And the cool ocean breezes shall blow from me, The memory of your name” ~ Laurence Hope

Related:

SHUTDOWN - With full list of reason codes
TSSHUTDN - Remotely shut down or reboot a terminal server
Powershell:
$os = (Get-WmiObject Win32_OperatingSystem -ComputerName MyServer64)
$os.psbase.Scope.Options.EnablePrivileges = $true
$os.reboot()
Equivalent bash command (Linux): shutdown - Shutdown or restart linux