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How To: Ubuntu Linux Firewall Open Port Command

How do I open port 80 and 443 on a Ubuntu Linux LTS version 14.04 server?
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FreeBSD Add a User To Wheel Group Command

How do I add a user to the wheel group in FreeBSD unix operating systems using command line options?
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How to execute script on the last day of a month on Linux or Unix bash shell? How do I run a disk usage or custom reporting shell/perl/python script on the last day of a month on a Linux or Unix-like systems?
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I'm a bash shell user. I would like to temporarily clear bash shell environment variables. I do not want to delete or unset an exported environment variable. How do I run a program in a temporary environment in bash or ksh shell?
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Suhosin is an advanced protection system for PHP installations. It was designed to protect servers and users from known and unknown flaws in PHP applications and the PHP core. How can I install suhosin extension on a Debian v8.x or Ubuntu Linux 14.04 LTS server?
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How To Find the WiFi Password on Mac OS X

I've MBP 13" laptop. How can I find out the Wifi password on Mac OS X using command line and GUI options?
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I'm using LXC (Linux Containers) a virtualization system running on a Ubuntu LTS. How can I update all my Ubuntu or Debian Linux based guests containers VM from host operating system?
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