Add and Multiply numbers using shell script

Question

I'm learning Shell scripting, I'm trying to write a small script that adds and multi number as shown below But amt value not display

value=212
amt=`expr "( $value * 2 + ( $value * 2 * .075 ) ) " | bc`
echo $amt

Answer 1

Your code works fine, but I suggest some improvements:

1. Use $(...) instead of backticks.
2. Replace expr with echo.

Example:

value=212
amt=$(echo "( $value * 2 + ( $value * 2 * .075 ) ) " | bc)
echo $amt

Output:

455.800