How to create a shell script using the conditional statement on CentOS and RHEL 6/7 step by step guide

In this article we will learn how to create a shell script using the conditional statement and execute it on CentOS and RHEL linux system and we are going to create a script with bash if statement to demonstrate example.

Shell script is very powerful language for a system admin to execute the daily basic staff.

In this article we use if else statement to understand the example.

Following bash operators are useful to write a conditional shell script program.

bash operator in shell script for linux unix system| techrideradmin

How to create a shell script using if else statement on linux system

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Now we are going to write one small shell script program to understand how conditional statement works in the shell script program on the linux system .

First we create one empty file named condition .sh using the below command.

#touch condition.sh

After creating empty file we enter the below line to create bash if statement in the file.

#!/bin/bash

echo How old are you?

read age

if [ “$age” –gt 25 ] then

echo you can drive

else

echo you can not drive

note: we shoule use #!/bin/bash to identify this script only run in bash shell not the other shell .

How to execute the shell script program

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To execute this program we need to execute the below command.

[root@localhost ~]# sh condition.sh

After execute the above command we can find the below output..

Output:

How old are you?

you can not drive

How to create a shell script using the conditional statement on CentOS and RHEL 6/7 step by step guide

That’s all. If this article is helpful to know about bash if statement please share it!!!!

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How to create a shell script using the conditional statement on CentOS and RHEL 6/7 step by step guide