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Linux Upgrade Password Hashing Algorithm to SHA-512

The default algorithm for storing password hashes in /etc/shadow is MD5. I was told to use SHA-512 hashing algorithm. How do I set password hashing using the SHA-256 and SHA-512 under CentOS or Redhat Enterprise Linux 5.4?
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Sysadmin because even developers need heroes!!!

Linux Hotplug a CPU and Disable CPU Cores At Run Time

I would like to dynamically enable or disable a CPU on a running system. How do I hotplug a CPU on a running Linux system? How do I disable cpu cores on a Linux operating system at run time?
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Solaris Buffer Overflow Protection

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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Debian Linux Install GNU GCC Compiler and Development Environment

How do I install GNU/GCC compiler and related tools (such as make, debugger, man pages) collection under Debian Linux system using command line options?
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How do I know When I Need To Update My Linux System Software?

Q. How do I know when I need to update my Linux system? How do I know new patches are available for CentOS Linux (Red Hat) / Debian Linux server system?
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Reboot Linux System Command

How do I reboot my Linux based system? How do I reboot a remote Linux system or server using command line?
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chrt command: Set / Manipulate Real Time Attributes of a Linux Process

Q. How do I set the real time scheduling priority of a process under Linux operating system using a shell prompt?
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Is There a UNIX / Linux unerase / undelete Command?

Q. Is There a UNIX / Linux unerase or undelete command? How do I undelete files under a UNIX / Linux system?
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How To Test Linux Operating System for IPv6 Networking Support

Q. Before I can start using IPv6 on a Linux server, how do I test, whether my Linux server system is IPv6 ready or not? If not, how do I enable IPv6 support under Redhat Enterprise Linux version 5?
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How to Set JAVA_HOME / PATH variables Under Linux Bash Profile

I just need a help to show me how to setup java path on Linux. How can I set JAVA_HOME and PATH variables for every user under my Linux system?
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