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A stack-based critical buffer overflow was found in the way the libresolv library (glibc) performed dual A/AAAA DNS queries. A remote attacker could crash or, potentially, execute code running the library on Linux. How do I patch and protect my server or workstation against the glibc getaddrinfo on Linux operating system?
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How to reload sysctl.conf variables on Linux

I am new Linux system user. How do I reload all sysctl variables without rebooting my server?
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How to install PHP 7 on Ubuntu Linux 14.04 LTS

PHP 7 provides 2x faster performance and 50% better memory consumption than PHP version 5.6. How do I install PHP 7 on Ubuntu Linux version 14.04 LTS server? How do I install PHP 7 with PHP-FPM in along with Nginx web server?
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Ubuntu sudo: add-apt-repository: command not found error and solution

I‘m trying to run a command ‘sudo add-apt-repository ppa:foo/bar‘ but getting the following error:

     sudo: add-apt-repository: command not found

How do I fix this problem on Ubuntu Linux 14.04 LTS server?
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How to create unprivileged LXC container on Ubuntu Linux 14.04 LTS

How do I install, create and manage unprivileged LXC containers on Ubuntu Linux version 14.04 LTS server?
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OS X install Amazon AWS command-line interface (CLI) tool

How do I setup and install the official Amazon AWS Command Line Interface (cli) on an Apple Mac OS X system?
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Ubuntu Linux Change Hostname (computer name)

I am a new Ubuntu Linux laptop user. I setup my computer name to ‘tom’ during installation but now I would like to change the computer name to ‘jerry’. How can I remove tom and set it to jerry on Ubuntu Linux? How do I change the Ubuntu computer name from ‘ubuntu’ to ‘AvlinStar’?
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How to install KVM on Ubuntu 14.04 LTS Headless Server

Kernel-based Virtual Machine (KVM) is a virtualization module for the Linux kernel that turns it into a hypervisor. How can I install KVM, setup guest operating system as the back-end virtualization technology for non-graphic Ubuntu Linux 14.04 LTS server?
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FreeBSD find the chmod numerical value for a file or directory

I need to find out the numerical value of a file on a FreeBSD system. For example, get 644 instead of -rw-r--r-- for the /etc/resolv.conf file. Is there is a way to get this value in my bash shell script?
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Linux Check Disk Space Command

I recently switched from a Windows server to a Linux server operating system. I am using Ubuntu LTS server. How do I find out disk space utilization information using command line option?
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