Book Image

Mastering Linux Shell Scripting

By : Andrew Mallett
Book Image

Mastering Linux Shell Scripting

By: Andrew Mallett

Overview of this book

Shell scripting is a quick method to prototype a complex application or a problem by automating tasks when working on Linux-based systems. Using both simple one-line commands and command sequences complex problems can be solved with ease, from text processing to backing up sysadmin tools. In this book, you’ll discover everything you need to know to master shell scripting and make informed choices about the elements you employ. Get to grips with the fundamentals of creating and running a script in normal mode, and in debug mode. Learn about various conditional statements' code snippets, and realize the power of repetition and loops in your shell script. Implement functions and edit files using the Stream Editor, script in Perl, program in Python – as well as complete coverage of other scripting languages to ensure you can choose the best tool for your project.
Table of Contents (21 chapters)
Mastering Linux Shell Scripting
About the Author
About the Reviewer

Displaying the browser data

The browser that is used to access the web site is contained within the log file in field 12. It may be interesting to display the list of browsers used to access your site. The following code will assist you in displaying the list of accesses by the reported browser:

{ browser[$12]++ }
    for ( b in browser )
        print b, " has accessed ", browser[b], " times."

You can see how we can create little plugins to awk with these files and adjust the field and array names to suit your own liking. The output is shown in the following screenshot:

Interestingly, we see that the Mozilla 4 and 5 make up the majority of the requesting client. We see that Mozilla 4 is listed here 1713 times. The Mozilla/5.0 entry here is malformed with an extra double-quote. It appears later with 27K accesses.