Mastering Linux Shell Scripting

Key FeaturesIdentify the high level steps such as verifying user input, using command lines and conditional statements in creating and executing simple shell scriptsCreate and edit dynamic shell scripts to manage complex and repetitive tasksLearn about scripting in Perl and programming in Python as a BASH scripting alternative with this practical, step-by-step guideBook DescriptionShell 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.What you will learnUse the type command to identify the order of command evaluationCreate interactive scripts that prompt for user inputFoster menu structures for operators with little command-line experienceDevelop scripts that dynamically edit web configuration files to produce a new virtual hostWrite scripts that use AWK to search and reports on log filesDraft effective scripts using functions as building blocks, reducing maintenance and build timeMake informed choices by comparing different script languages such as Perl and Python with BASHAbout the AuthorAndrew Mallett is the owner of The Urban Penguin and is a comprehensive provider for professional Linux software development, training, and services. Having always been a command-line fan, he feels that so much time can be saved through knowing command-line shortcuts and scripting. TheUrbanPenguin YouTube channel, maintained by Andrew, has well over 800 videos to support this and he has authored four other Packt titles.Table of ContentsWhat and Why of Scripting with BashCreating Interactive ScriptsConditions AttachedCreating Code SnippetsAlternative SyntaxIterating with LoopsCreating Building Blocks with FunctionsIntroducing sedAutomating Apache Virtual HostsAwk FundamentalsSummarizing Logs with AwkA Better lastlog with AwkUsing Perl as a Bash Scripting AlternativeUsing Python as a Bash Scripting Alternative

Author: Andrew Mallett

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