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Command substitution takes the output of one Linux command and makes it an argument in another command.

The script command makes a transcript of the text that is printed to the terminal. You can record your interaction with the shell using this command.

The read command can be used to capture input by a user and use it as a variable within the script.

This tutorial describes how awk can use operators to increment or decrement as well as other arithmetic functions. awk uses four arithmetic functions: + addition - subtraction * multiplication and / division.

The Bash Shell is capable of performing math functions for you in the shell. This is a helpful tool for writing shell scripts.

The positions of variables in a Bash Shell script may be used by the script as a reference. These built-in parameters are useful methods for building scripts.

The use of ACLs is fairly simple, a basic understanding of Linux file and directory permissions is required. Permissions may be set for any number of users or groups individually.

ACLs provide better options for various users or groups to the same file or directory in Linux. ACLs are becoming a standard feature of many of the server installs.

When a server or device is being worked on and you need to schedule downtime so Nagios does not notify administrators that can be performed at the web interface.

The Bash Shell reads command line until it reaches a carriage-return. This permits the user to create very long command strings if necessary.

Which method you use to install Nagios determines how it can be used down the road. It is best to think carefully about whether you should compile or install from a RPM or DEB file.

There are a number of ways you can use pipes in the Bash Shell to send the output of one command into the input in another command.

The official Nagios training classes, taught online by Mike Weber of CyberMontana Inc, have been scheduled for January 2011.

There are 7 Linux file types: regular files, directories, character device files, block device files, domain sockets, named pipes and symbolic links. This tutorial explains each with illustrations.

How to use a Bash Shell script to record the activity of users. This script is useful in rebuilding the actions of users as they work at the command line.

Processes are required to respond to signals sent to them. This is one way a user can communicate with signals and control them.

Nagios is the foundation for many networking applications world wide and is know for its flexibility. Building upon those concepts is a new project named the Nagios Visual Shell (V-Shell). What follows is a short review of V-Shell and an interview with the lead developer of this new Nagios project.

You can direct grep to search through one file or many. You can also pipe in output from some other utility so that you’ll see only the information that you want to see. And, the fact that grep uses regular expressions allows you to perform searches even when you only have an approximate idea of what you’re searching for.

Did you know you can easily change the way Nagios looks? Nagios has a number of options for frontends, or skins for the Nagios web interface. These frontends change the look of Nagios. Often these frontends are a matter of preference as they do not change the functionality of the program at all. They are easily changed and and restored if you follow some basic principles.

In addition to creating programming structures, you can also use the semi-colon to separate stand-alone commands that you want to execute from the same command entry. If you wanted to cd to a certain directory and then look at its contents, you could enter each command on its own line. Or, you could enter them both on the same line. This process is called command chaining.