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Linux Shell Scripting Cookbook, Second Edition

You're reading from   Linux Shell Scripting Cookbook, Second Edition Don't neglect the shell – this book will empower you to use simple commands to perform complex tasks. Whether you're a casual or advanced Linux user, the cookbook approach makes it all so brilliantly accessible and, above all, useful.

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Product type Paperback
Published in May 2013
Publisher Packt
ISBN-13 9781782162742
Length 384 pages
Edition 2nd Edition
Tools
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Toc

Table of Contents (16) Chapters Close

Linux Shell Scripting Cookbook
Credits
About the Authors
About the Reviewers
www.PacktPub.com
Preface
1. Shell Something Out FREE CHAPTER 2. Have a Good Command 3. File In, File Out 4. Texting and Driving 5. Tangled Web? Not At All! 6. The Backup Plan 7. The Old-boy Network 8. Put on the Monitor's Cap 9. Administration Calls Index

Sorting unique and duplicates


Sorting is a common task that we can encounter with text files. The sort command helps us to perform sort operations over text files and stdin. Most often, it can also be coupled with many other commands to produce the required output. uniq is another command that is often used along with a sort command. It helps to extract unique (or duplicate) lines from a text or stdin. This recipe illustrates most of the use cases with sort and uniq commands.

Getting ready

The sort command accepts input as filenames, as well as from stdin (standard input) and outputs the result by writing into stdout. The same applies to the uniq command.

How to do it...

  1. We can easily sort a given set of files (for example, file1.txt and file2.txt) as follows:

    $ sort file1.txt file2.txt > sorted.txt
    

    Or:

    $ sort file1.txt file2.txt -o sorted.txt
    
  2. For a numerical sort, we can use:

    $ sort -n file.txt
    
  3. To sort in the reverse order, we can use:

    $ sort -r file.txt
    
  4. For sorting by months (in the order...

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