How to use Case Statement on Bash Script

To use case Statement on Bash Script ?

Introduction:

A case statement in bash scripts is used when a decision has to be made against multiple choices. In other words, it is useful when an expression has the possibility to have multiple values. This methodology can be seen as a replacement for multiple if-statements in a script. Case statements have an edge over if-statements because it improves the readability of our code and they are easier to maintain.

Installation Steps:

Step1: Check the Oracle Linux Version by using the below command

[root@linuxhelp ~]# cat /etc/os-release
NAME="Oracle Linux Server"
VERSION="9.2"
ID="ol"
ID_LIKE="fedora"
VARIANT="Server"
VARIANT_ID="server"
VERSION_ID="9.2"
PLATFORM_ID="platform:el9"
PRETTY_NAME="Oracle Linux Server 9.2"
ANSI_COLOR="0;31"
CPE_NAME="cpe:/o:oracle:linux:9:2:server"
HOME_URL="https://linux.oracle.com/"
BUG_REPORT_URL="https://github.com/oracle/oracle-linux"
ORACLE_BUGZILLA_PRODUCT="Oracle Linux 9"
ORACLE_BUGZILLA_PRODUCT_VERSION=9.2
ORACLE_SUPPORT_PRODUCT="Oracle Linux"
ORACLE_SUPPORT_PRODUCT_VERSION=9.2

Step 2: Next create a one script file for Case Statement by using Vim command

[root@linuxhelp ~]# vim casestatement
#!/bin/bash
echo -n "Are you a Student  [Yes] or [No] : "
read response
case $response in

        "Y" | "y" | "yes" | "Yes" | "YES" )
        echo -n "Yes,I am a student"
        ;;
        "N" | "n" | "no" | "No" | "NO" )
        echo -n "No,I am not a student"
        ;;
        *)
        echo -n "Invalid Response"
        ;;
esac

Step 3: Execute the script first change the executable file permission by using the following command

[root@linuxhelp ~]# chmod +x casestatement

Step 4: List the file by using the following commands

[root@linuxhelp ~]# ll
total 8
-rw-------. 1 root root 1062 Sep  4 17:37 anaconda-ks.cfg
-rwxr-xr-x. 1 root root  345 Sep 25 16:47 casestatement

Step 5: Execute the script by using the following command

[root@linuxhelp ~]# ./casestatement
Are you a Student  [Yes] or [No] : y
Yes,I am a student[root@linuxhelp ~]#

Step 6: Again, execute the script by using the following command.

[root@linuxhelp ~]# ./casestatement
Are you a Student  [Yes] or [No] : n
No,I am a student[root@linuxhelp ~]#

Step 7: Again, execute the script by using the following command

[root@linuxhelp ~]# ./casestatement
Are you a Student  [Yes] or [No] : t
Invalid Response[root@linuxhelp ~]#

Conclusion:

We have reached the end of this article. In this guide, we have walked you through the steps required to use case Statement on Bash Script. Your feedback is much welcome.