Linux how to force quit the process by root

I have run the command to backup 7 accounts and then i want to quit that command while its running. How can i quit from command line

I want that it should quit backing up all accounts not just current account and then i have to press again untill all accounts open

From serverfault Master

• Ctrl+C will kill the command if you ran it in the foreground from the same shell.

  kill -9 will destroy everything in its path if you are killing it from a different environment, or you ran the command in the background.

  Master : i tried ctrl c but it then come to shell but processing is still going on

  Dennis Williamson : Please don't do `kill -9` when it's not necessary. http://sial.org/howto/shell/kill-9/ and http://mywiki.wooledge.org/ProcessManagement#I.27m_trying_to_kill_-9_my_job_but_blah_blah_blah...
  From MattC

• Use ps aux command to determine process which runs next backup and kill it, for example with kill -9.

  Dennis Williamson : Please don't do `kill -9` when it's not necessary. http://sial.org/howto/shell/kill-9/ and http://mywiki.wooledge.org/ProcessManagement#I.27m_trying_to_kill_-9_my_job_but_blah_blah_blah...
  From radious