ProDeveloperTutorial.com

Tutorials and Programming Solutions
Menu
  • Shell Scripting
  • System Design
  • Linux System Programming
  • 4g LTE
  • Coding questions
  • C
  • C++
  • DSA
  • GIT
  • 450 DSA Cracker
  • 5G NR
  • O-RAN

Shell Script Chapter 7: Shell Script case, break and continue statements

prodevelopertutorial February 13, 2019

In this chapter we shall look at the below topics:
7.1 Case Statement
7.2 Break statement
7.3 Continue statement

7.1 Case Statement

case statement is used when there is multiple case of if-else statements.

Syntax:

case <expression> in
pattern_1 )
statements;;

pattern_2 )
statements;;

*)
default_condition;;
esac

Note: “case” “in” “)” “;;” “esac” are the keywords used.

“;;” will be used to indicate that the statements containing to a particular case has ended. “*)” is used for default condition.

Example 1:

In this example, we shall start/stop service according to user input:

#!/bin/bash

case "$1" in

'start')
echo "starting the service";;
'stop')
echo "stopping the service";;
*)
echo "enter start or stop";;
esac

Output:

./case_example.sh start
starting the service

Example 2:

Check the character the user has entered and print approprite value

#!/bin/bash
echo -e "Enter a value"
read value

case $value in

[a-z])
echo "The value $value is in a to z";;
[A-Z])
echo "The value $value is in A to Z";;
[0-9])
echo "The value $value is in 0 to 9";;
?)
echo "The value $value is a speciall character";;
esac

Output:

Enter a value
5
The value 5 is in 0 to 9

7.2 Break statement:

Break statement is used to exit the current loop before it’s normal execution. Usually we use this whenever we want to exit the loop prematurely

Example:

In the below example, we run the loop from 1 to 10. But we want to exit out of the loop, when the value is 5. Then we can use “break” statement.

#!/bin/bash

for i in 1 2 3 4 5 6 7 8 9 10
do
if [ $i -eq 5 ]
then
break
fi
echo "$i"
done

Output:

sh 2_.sh
1
2
3
4

 

7.3 Continue statement:

Continue statement is used to skip the execution of the loop, but it will not exit the loop.

Example:

In the example below, when the “i” value is equall to 5, it will skip the execution but will not exit the loop. In the output also, only the value “5” will not be printed.

#!/bin/bash

for i in 1 2 3 4 5 6 7 8 9 10
do
if [ $i -eq 5 ]
then
continue
fi
echo "$i"
done

Output:

 

sh 2_.sh
1
2
3
4
6
7
8
9
10

List Of Tutorials available in this website:

C Programming 20+ ChaptersC++ Programming 80+ Chapters
100+ Solved Coding QuestionsData Structures and Algorithms 85+ Chapters
System design 20+ ChaptersShell Scripting 12 Chapters
4g LTE 60+ ChaptersMost Frequently asked Coding questions
5G NR 50+ ChaptersLinux System Programming 20+ chapters
Share
Email
Tweet
Linkedin
Reddit
Stumble
Pinterest
Prev Article
Next Article

About The Author

prodevelopertutorial

Follow this blog to learn more about C, C++, Linux, Competitive Programming concepts, Data Structures.

Leave a Reply Cancel Reply

You must be logged in to post a comment.

ProDeveloperTutorial.com

Tutorials and Programming Solutions
Copyright © 2023 ProDeveloperTutorial.com
We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. By clicking “Accept”, you consent to the use of ALL the cookies.
Do not sell my personal information.
Cookie SettingsAccept
Manage consent

Privacy Overview

This website uses cookies to improve your experience while you navigate through the website. Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. We also use third-party cookies that help us analyze and understand how you use this website. These cookies will be stored in your browser only with your consent. You also have the option to opt-out of these cookies. But opting out of some of these cookies may affect your browsing experience.
Necessary
Always Enabled
Necessary cookies are absolutely essential for the website to function properly. These cookies ensure basic functionalities and security features of the website, anonymously.
CookieDurationDescription
cookielawinfo-checkbox-analytics11 monthsThis cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Analytics".
cookielawinfo-checkbox-functional11 monthsThe cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional".
cookielawinfo-checkbox-necessary11 monthsThis cookie is set by GDPR Cookie Consent plugin. The cookies is used to store the user consent for the cookies in the category "Necessary".
cookielawinfo-checkbox-others11 monthsThis cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Other.
cookielawinfo-checkbox-performance11 monthsThis cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Performance".
viewed_cookie_policy11 monthsThe cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. It does not store any personal data.
Functional
Functional cookies help to perform certain functionalities like sharing the content of the website on social media platforms, collect feedbacks, and other third-party features.
Performance
Performance cookies are used to understand and analyze the key performance indexes of the website which helps in delivering a better user experience for the visitors.
Analytics
Analytical cookies are used to understand how visitors interact with the website. These cookies help provide information on metrics the number of visitors, bounce rate, traffic source, etc.
Advertisement
Advertisement cookies are used to provide visitors with relevant ads and marketing campaigns. These cookies track visitors across websites and collect information to provide customized ads.
Others
Other uncategorized cookies are those that are being analyzed and have not been classified into a category as yet.
SAVE & ACCEPT