Book Image

Linux Shell Scripting Essentials

By : Sinny Kumari, Khem Raj
Book Image

Linux Shell Scripting Essentials

By: Sinny Kumari, Khem Raj

Overview of this book

Table of Contents (15 chapters)
Linux Shell Scripting Essentials
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

Switch to my choice


Switch is used to jump and run a certain case as per the result of the condition or expression is evaluated. It acts as an alternative to using multiple if in bash and keeps bash script much clear and readable.

The syntax of switch is as follows:

case $variable in
  pattern1)
  # Tasks to be executed
  ;;
  pattern2)
  # Tasks to be executed
  ;;
  …
  pattern n)
  # Tasks to be executed
  ;;
  *)
esac

In syntax, $variable is the expression or value that needs to be matched among the list of choices provided.

In each choice, a pattern or a combination of patterns can be specified. The ;; tells bash that end of given choice block. The esac keyword specify end of case block.

The following is an example to count the number of files and directories in a given path:

#!/bin/bash
# Filename: switch_case.sh
# Description: Using case to find count of directories and files in a # path

echo "Enter target path"
read path
files_count=0
dirs_count=0

for file in 'ls -l $path | cut -d '...