Shutdown computer after a specific command has been executed

[Muntasim-Ul-Haque]

Hi,
I need a tool that would make sure that, my computer would shutdown 
after a specific command has been executed. This tool would just wait 
for the Terminal for executing a command, like '/sudo apt-get upgrade/' 
and then after the command has been executed, my computer would 
shutdown. Is that possible? Is there a tool or anything out there that 
can do this for me? Let me know. It would be of great help. Thanks in 
advance.
Muntasim-Ul-Haque