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AWK: Print header line and pattern match

AWK is a powerful regular expression filtering and pattern matching scripting language. Please consider heading to awk tutorials section to read through our other awesome AWK tutorials which deep dive into different aspects of...

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Installing Nagios on Centos 7

Introduction Nagios is an extremely popular open source monitoring and alerting tool. The name nagios is an offshoot of an older system called ‘net saint’. Although Nagios has it’s limits and is not an all in...

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Fixing git/github merge conflicts

Introduction In our previous article on the git version control system, we explained how we could modify our files in repositories in our GitHub account and then pull the changes from GitHub to the git repositories on our local...

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    6 Ruby substrings examples

    The substring is a part of string/variable. We can create substrings from a ruby string variable. We already dealt with substrings in Shell scripting in our early post. This substring can be one character length or multiple...

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        Monitoring a Remote Centos 6 server with Nagios core

        Introduction In our earlier articles on nagios we explained in detail how to install nagios core on the centos 6 system and configure it. In this article we will explain step by step how to monitor a remote machine with nagios...

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        Here documents in bash explained

        Introduction Input/output redirection is an extremely important aspect of writing bash shell scripts and working with the bash shell command line interface in general. A here document is a form of I/O redirection that tells the...

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          Fixing git/github merge conflicts

          Introduction In our previous article on the git version control system, we explained how we could modify our files in repositories in our GitHub account and then pull the changes from GitHub to the git repositories on our local...

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          Bind DNS server setup on Centos 7

          Introduction In one of our earlier articles we demonstrated how to configure a caching only DNS server. In this article we will be explaining the step by step process of configuring a DNS server using bind. Along with the DNS...

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          My name is Surendra Kumar Anne. I hail from Vijayawada which is cultural capital of south Indian state of Andhra Pradesh. I am a Linux evangelist who believes in Hard work, A down to earth person, Likes to share knowledge with others, Loves dogs, Likes photography. At present I work at Bank of America as Sr. Analyst Systems and Administration. You can contact me at surendra (@) linuxnix dot com.