If-else is a very important coding concept. Just like other programming languages, shell script uses if-else statements to solve problems. 

`If` a condition is true, the algorithm performs a certain action; `else`, it performs something else. 

# Syntax

```shell
if [ condition ]
then
  trueAction....
else
  falseAction
fi
```

# Code
The following code outputs "Yes" if the two numbers are equal and "No" if they are not. 

var1=50 
var2=60   

if [ $var1 == $var2 ] 
then 
    echo "YES"
else 
    echo "NO"
fi 

The if-else condition in shell script

If-else in shell script executes actions based on whether a condition is true or false.