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linux system

Linux: Bash Get Time

How do I get the system time in BASH? How can I get the Linux system using bash shell?
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Delete SSH Keys

One my user leaves the office and I'd like to disable her access to our UNIX / Linux system. How do I delete ssh key from the UNIX systems so that user can not log in?
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Linux: Change the PATH [ Add New Directory ]

How do I change the PATH settings under Linux operating systems and add a new directory to $PATH under bash shell?
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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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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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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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