This article is part of the on-going Awk Tutorial Examples series. In our earlier awk articles, we discussed about awk print, awk user-defined variables, awk built-in variables, and awk operators. In this awk tutorial, let us review awk conditional if statements with practical examples. Awk supports lot of conditional statements to control the flow of [...]
Linux
As part of the contest we conducted recently, we got 160+ comments from the geeky readers who choose their favorite firewall. Based on this data, the top spot goes to.. drum roll please.. iptables If you are new to any of the top 5 firewalls mentioned here, please read the rest of the article to [...]
In the first article of this series we saw how awk could be put to work (or play) for more than just processing text. The simple script demonstrated the use of associative arrays, recursion and how we could use more arrays (more than required to represent the data) to speed up the processing. There were [...]
Thanks for visiting this article from the Nagios newsletter. We’ll be posting several Nagios XI tutorials in the upcoming weeks. Subscribe to our articles and don’t miss any future Nagios XI step-by-step tutorials. Nagios Price: Nagios Core is free and open source. Nagios XI is $1,295 (to monitor unlimited number of hosts). This is perpetual [...]
This article is part of the on-going Awk Tutorial Examples series. In our earlier awk articles, we discussed about awk print, awk user-defined variables, and awk built-in variables. Like any other programming language Awk also has lot of operators for number and string operations. In this article let us discuss about all the key awk [...]
I personally prefer to use less command to view files (instead of opening the file to view in an editor). Less is similar to more command, but less allows both forward and backward movements. Moreover, less don’t require to load the whole file before viewing. Try opening a large log file in Vim editor and [...]
This article is part of the on-going Awk Tutorial Examples series. Awk has several powerful built-in variables. There are two types of built-in variables in Awk. Variable which defines values which can be changed such as field separator and record separator. Variable which can be used for processing and reports such as Number of records, [...]
Question: What are the basic fundamental things I should know to execute a shell script? Also, when I execute my shell script I get “Permission denied” error message. How do I fix it? Answer: Let us review the 4 basic fundamental things you should know about executing a shell script. 1. Locate the shell executable [...]
My name is Ramesh Natarajan. I will be posting instruction guides, how-to, troubleshooting tips and tricks on Linux, database, hardware, security and web. My focus is to write articles that will either teach you or help you resolve a problem. Read more about