Converting lowercase to uppercase in shell script

Question

I tried to convert a lowercase string to uppercase and assign it to a variable using the following code

The script is written in .tn extension

Answer 1

Below Works, Try this.

bash-3.2$echo lower to upper | tr '[:lower:]' '[:upper:]'
LOWER TO UPPER  

# To Save in the variable use below
var=$(echo lower to upper | tr '[:lower:]' '[:upper:]')