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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

Finding the frequency of words used in a given file


Finding the frequency of words used in a file is an interesting exercise to apply the text-processing skills. It can be done in many different ways. Let's see how to do it.

Getting ready

We can use associative arrays, awk, sed, grep, and so on, to solve this problem in different ways. Words are alphabetic characters, delimited by space or a period. First, we should parse all the words in a given file and then the count of each word needs to be found. Words can be parsed by using regex with any of the tools, such as sed, awk, or grep.

How to do it...

We just saw the logic and ideas about the solution; now let's create the shell script as follows:

#!/bin/bash
#Name: word_freq.sh
#Desc: Find out frequency of words in a file

if [ $# -ne 1 ];
then
  echo "Usage: $0 filename";
  exit -1
fi

filename=$1

egrep -o "\b[[:alpha:]]+\b" $filename | \

awk '{ count[$0]++ }
END{ printf("%-14s%s\n","Word","Count") ;
for(ind in count)
{  printf("%-14s%d\n...
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