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init command

CentOS / RHEL Linux: Remove GDM

One of the most common ways for hackers to break into a Solaris system is to exploit buffer overflows. How do I turn on buffer overflow protection under Solaris UNIX operating system just like CentOS/Redhat Linux system?
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Linux change the runlevel for a server without rebooting

Q. How do I change the runlevel for a Linux server without rebooting my server? I am using Gentoo Linux.
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