Linux Shell Scripting Cookbook by Sarath Lakshman

By Sarath Lakshman

Solve real-world shell scripting issues of over one hundred ten easy yet awfully potent recipes
* grasp the artwork of crafting one-liner command series to accomplish initiatives resembling textual content processing, digging information from documents, and lot more
* functional challenge fixing thoughts adherent to the newest Linux platform
* choked with easy-to-follow examples to workout the entire positive aspects of the Linux shell scripting language
* a part of Packt's Cookbook sequence: every one recipe is a gently equipped series of directions to accomplish the duty as successfully as possible

In Detail

GNU/Linux is a amazing working procedure that includes a whole improvement atmosphere that's sturdy, trustworthy, and very robust. The shell being the local interface to speak with the working process is able to controlling the complete working process. there are many instructions on Linux shell that are documented yet not easy to appreciate. the guy pages are important yet they're very long and it doesn't supply any clues on key components the place instructions can be utilized. right utilization of shell instructions can simply clear up many advanced projects with a couple of strains of code, yet so much linux clients don't have the precise information to exploit the Linux shell to its complete potential.

Linux Shell Scripting Cookbook is a set of crucial command-line recipes besides precise descriptions tuned with sensible functions. It covers lots of the instructions on Linux with quite a few usecases observed by means of lots of examples. This e-book enables you to practice complicated facts manipulations concerning initiatives resembling textual content processing, dossier administration, backups and extra with the mix of few commands.

Linux Shell Scripting Cookbook exhibits you the way to capitalize on the entire elements of Linux utilizing the shell scripting language. This ebook teaches you the way to exploit instructions to accomplish basic initiatives all of the option to scripting advanced initiatives corresponding to handling quite a lot of info on a network.

It courses you on imposing one of the most universal instructions in Linux with recipes that deal with any of the operations or houses comparable with records like looking and mining within a dossier with grep. It additionally exhibits you ways utilities resembling sed, awk, grep, minimize may be mixed to unravel textual content processing similar difficulties. the point of interest is on saving time through automating many actions that we practice interactively via as browser with a couple of traces of script.

This booklet will take you from a transparent challenge description to an absolutely sensible application. The recipes contained in the bankruptcy will introduce the reader to precise difficulties and supply hands-on solutions.

This functional publication can help you achieve regulate over all of the facets of Linux utilizing the strong shell scripting language

What you are going to research from this book
* discover numerous general utilization initiatives and the way it may be made swifter utilizing shell command
* Couple often used instructions like grep, locate, sed, awk
* Write shell scripts which can dig facts from net and method it with few strains of code
* practice and automate projects akin to automating backups and repair with archiving tools
* comprehend dossier structures, dossier forms and manipulations
* Create and preserve file/folder documents, compression codecs and encrypting ideas with shell
* manage Ethernet and instant LAN with the shell script
* visual display unit assorted actions at the community utilizing logging techniques

Approach

This publication is written in cookbook variety and it bargains studying via recipes with examples and illustrations. every one recipe comprises step by step directions approximately every little thing essential to execute a selected activity. The booklet is designed for you to learn it from begin to finish for beginner's or simply open up any bankruptcy and begin following the recipes as a reference for complex users.

Who this publication is written for

If you're a newbie or an intermediate consumer who desires to grasp the ability of quick writing scripts to accomplish a variety of initiatives with out analyzing the total guy pages, this booklet is for you. you can begin writing scripts and one-liners through easily the same recipe and its descriptions with none operating wisdom of shell scripting or Linux. Intermediate/advanced clients in addition to approach adminstrators/ builders and programmers can use this ebook as a reference after they face difficulties whereas coding.

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Example text

Usually, three modes are used: ff Read mode ff Write with truncate mode ff Write with append mode < is an operator used to read from the file to stdin. > is the operator used to write to a file with truncation (data is written to the target file after truncating the contents). >> is an operator used to write to a file with append (data is appended to the existing file contents and the contents of the target file will not be lost). File descriptors can be created with one of the three modes. txt Now you can use file descriptor 3 with commands.

Use a delimiter character to end the input line as follows: read -d delim_charvar For example: $ read -d ":" var hello:#var is set to hello Field separators and iterators The Internal Field Separator is an important concept in shell scripting. It is very useful while manipulating text data. We will now discuss delimiters that separate different data elements from single data stream. An Internal Field Separator is a delimiter for a special purpose. An Internal Field Separator (IFS) is an environment variable that stores delimiting characters.

It can be used to analyze whether a command completed its execution successfully or unsuccessfully. If the command exits successfully, the exit status will be zero, else it will be non-zero. sh CMD="command" #Substitute with command for which you need to test exit status $CMD if [ $? –eq 0 ]; then echo "$CMD executed successfully" else echo "$CMD terminated unsuccessfully" fi Passing arguments to commands Arguments to commands can be passed in different formats. Suppose –p and -v are the options available and -k NO is another option that takes a number.

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