shutdown command

I can login as root user on Debian or Ubuntu/RHEL/CentOS Linux based system. I need to log everyone off to install new kernel and/or hardware. How do I do this on Linux? What is the best way to logout ALL USERS remotely over the ssh based session in Linux like operating systems?

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I am a new RHEL (Red Hat Enterprise Linux) version 6 server admin user. What is the command to shut down a RHEL based system over the ssh based session? How do I shutdown a CentOS Linux based system?

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Red Hat Enterprise Linux v6.3 has been released and available via RHN for immediate update. How do I upgrade my RHEL from 6.2 to the latest 6.3 version?

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How do I reboot my HP Linux server using command line option? How do I remotely reboot my CentOS or Debian based Linux server?

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I‘m a new Linux user. How do I shutdown Linux based system using command line options?

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How do I shutdown a Linux powered server using command line option?

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How do I shutdown Linux system from terminal or command line options?

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