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Docker swarm is (aka Docker engine in swarm mode) a native clustering solution that makes a group of Docker hosts into a single logical virtual server. Swarm ensures availability and high performance of your application by…

Graylog is an open-source log management tool which helps you to collect, index and analyze any machine logs centrally. This guide will help you to install Graylog on CentOS 7 / RHEL 7. Components MongoDB – Being a database to…

When you review all the Awk examples we have covered so far, right from the start of the Awk series, you will notice that all the commands in the various examples are executed sequentially, that is one after the other. But in certain…

All along from the beginning of the Awk series up to Part 12, we have been writing small Awk commands and programs on the command line and in shell scripts respectively. However, Awk, just as Shell, is also an interpreted language,…

When we write shell scripts, we normally include other smaller programs or commands such as Awk operations in our scripts. In the case of Awk, we have to find ways of passing some values from the shell to Awk operations. This can be done…

As we uncover the section of Awk features, in this part of the series, we shall walk through the concept of built-in variables in Awk. There are two types of variables you can use in Awk, these are; user-defined variables, which we covered…

In Part 8 of this Awk series, we introduced some powerful Awk command features, that is variables, numeric expressions and assignment operators. As we advance, in this segment, we shall cover more Awk features, and that is the special…

The Awk command series is getting exciting I believe, in the previous seven parts, we walked through some fundamentals of Awk that you need to master to enable you perform some basic text or string filtering in Linux. Starting with this…

Graylog is an open-source log management tool that helps you to collect, index and analyze any machine logs centrally. This guide focuses on installing Graylog on Ubuntu 18.04 / Ubuntu 16.04. Components MongoDB – Acts as a…

In the previous parts of the Awk tool series, we looked at reading input mostly from a file(s), but what if you want to read input from STDIN. In this Part 7 of Awk series, we shall look at few examples where you can filter the output of…