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Linux / Unix: Find Out DNS Server IP Address / Names

How do I find out my DNS server IP address assiged my my ISP under Unix or Linux operating system using command prompt? How do I find preferred dns server under Debian / Ubuntu / Fedora Linux desktop system?
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Where Is The Xorg.conf File Located under Unix / Linux / BSD?

I want to find and edit my xorg.conf file for tweaking and configure it for new settings. The problem is that I'm unable to find the file. According to my research, xorg.conf should in /etc/X11 or /usr/X11R6/lib/X11/ directory. I found directories but not the file in directories. How do I find the xorg.conf under Unix or Linux like operating systems?
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Linux Deleting Firewall Rules

I would like to to delete my iptables based firewall rules under Linux. How do I delete rules individually or all at once under CentOS or Fedora Linux or RHEL based servers?
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HowTo: Linux Restart Network Interface

How do I restart network interface under Linux operating systems after making changes to IP configuration without rebooting the box?
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FTP site at osuosl to download Linux ISO / Software

Q. Can you give me FTP site address at osuosl, so that I can download Linux ISO and other software?

A. The Open Source Lab (osuosl) facilitates open source communities and the development and distribution of Open Source Software (OSS). They provide hosting projects and developing software via their web site. The Open Source Lab is a group at Oregon State University dedicated to supporting and developing Open Source software. A wide range of projects are hosted at the lab including Gentoo, Mozilla, Debian, Freenode etc.

osuosl FTP site

Visit ftp site to download Ubuntu, Apache, Slackware, Gentoo, and other OSS software.