linux system

Linux: Bash Get Time

by on October 27, 2010 · 1 comment

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

by on June 24, 2010 · 5 comments

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?


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?


How do I hotplug a CPU on a running Linux system? I would like to dynamically enable or disable a CPU on a running system?


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?


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?