In the first part of this article series on shell scripting we covered basics of what shell scripting is and how we can use it like other programming languages to automate our work. Now we are going to cover some more advanced technique such as arrays, functions, networking etc which makes these shell scripts much more than just bunch of commands.
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This tutorial is a three part series as an introduction to Bash Shell Scripting. Part I is mainly basics of shell scripting and is generic, Part II will gradually move towards some more advanced techniques and focus mostly on the bash shell and finally in Part III we will try to use all the techniques to create working program.
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We can say, the shell (also termed as the command line interpreter) is as old as the Unix operating system. The first Unix shell, called the Thomson Shell,  was developed by Kenneth Thompson in 1971. However, with time and technology, the idea of shell has propagated to the presently available number of shells which we use so commonly and easily on Linux Operating System. This  article is dedicated to understanding the current definition of shell and its supported features and functionality.
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Have you ever thought that how can you run a standard command line utility(for example : ‘cp’) from any directory in the shell irrespective of it’s presence in that directory? How does the shell know where the executable is present and whether it is present at all?
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