The tutorial will explain about how to set hostname and FQDN on CentOS 7 and RHEL 7 (Red Hat Enterprise Linux 7). In our previous post “How to change hostname on CentOS and Red Hat“, we have already define the difference between hostname and FQDN. Hence suggest to read this post. In Red Hat Enterprise…
Bash Code Injection Vulnerability via Specially Crafted Environment Variables (CVE-2014-6271 (aka Shellshock ), CVE-2014-7169). This is one the most vulnerable bug we have seen in Linux at current time. Due to this bug, we are seeing lots of business impact in entire world. Details of CVE-2014-6271 A flaw was found in the way Bash evaluated…
This time I made a thought to share something interesting.It is not related to system admin but it is just for fun. I generally use ubuntu most of the time for my desktop purposes. Hope you will like this matrix effect on your terminal. First you have to install cmatrix package into your system. It…
In this post I am sharing a small tip which is very useful while for system admins. The tip is about how to print duplicate lines from file. Sometimes we get the big file with lot of contents.And there may be chances of duplicate lines. To find the duplicate lines from file, use the below…
With this post you will also learn, how to find RPM packages which has certain command or files. You may have encounter with the error like “netstat command not found” on Red Hat based operating system. This time, on exploring and using CentOS 7, I found many changes. Generally I prefer to go with minimal…
In this post we will learn how to install EPEL repo on CentOS 7 and RHEL 7. On our previous post of “How to install EPEL repo in CentOS/Scientific Linux/Red Hat” , we have already written about EPEL repo. Extra Packages for Enterprise Linux (or EPEL) is a Fedora Special Interest Group that creates, maintains,…
Today, in this post we will explain about linux clear command and its keyboard shortcut. Like cls command on Windows, on linux we use clear command.clear command is available on all Unix like Operating System. clear command clears output and command on console or terminal window. In short words, clear command clear the screen. But…
In this tutorial we will learn about how to install Nagios 4 on CentOS 7/RHEL 7 . To install nagios we will use its stable source code, which is avaible at Nagios site. Nagios is one the most popular, stable and reliable monitoring tool. It is available as free and Open source package called Nagios…
In this post we will learn, how to clear apc cache by using php script. A few days back, one of the reader of our blog asked a question. It was about how to clear php APC cache.The question was asked on our previous post on PHP APC error. Follow the given below steps to…
VLC media player is a portable, free and open-source, cross-platform media player(Linux,Windows,OSX,BSD etc.) and streaming media server written by the VideoLAN project. This is my first post on VLC media player.Recently a question was asked by a newbie to me. His question was , how to install VLC media player on Ubuntu 14.04 LTS. There…
In this tutorial we will learn, how to install Nagios 4 from source on Ubuntu 14.04 LTS. In this practical I have seen some problems while Nagios core 4 installation. Because in Ubuntu 14.04 LTS is shipped with new Apache 2.4 version ,it was quite obvious some extra steps we have to do. I will…
After a long time I created a repo on my Github account.Creating a repo is quite easy on Github, simply login to your account and click on ‘create repo’ button. After creating git repo, now it was time to push all my codes from my desktop to github repo. After cloning the repo into my…
Question : Recently CentOS 7 and RHEL 7 is released. After doing minimal installation, I have not find ifconfig command. Do we have alternate of ifconfig command ? Let me describe the problem – After installation, I have to connect my system to internet. But ifconfig command is not found . I read your previous…
This is a single line sed command to illustrate the example of , ” How to print particular line number by using sed command ” . sed command are the ultimate stream line editor. Often we generally share sed related tips. Given below is content of file called test. Absolute path is /tmp/test This is…
Today while working on CentOS 7, I used yum command to install some packages. But I interrupted the yum command by pressing CTRL + C from keyboard. Which lead me to this error : There are unfinished transactions remaining. You might consider running yum-complete-transaction, or “yum-complete-transaction –cleanup-only” and “yum history redo last”, first to finish…