There's a trick, e.g. process substition, to bring the final value of "inside num" to "outside num". For integers: num=$((num1 + 2 + 3)) # ... Using the external expr utility. Note that this is only needed for really old systems. For floating point: Bash doesn't directly support this, but there are a couple of external tools you can use:

Jul 1, 2024 · In this tutorial, we will show you a few methods to add two numbers in a Bash script. You will learn how to use expr and the built-in features of the Bash shell to calculate the sum. This will help you understand how to do basic math operations in your …

Arithmetic in POSIX shells is done with $ and double parentheses (( )): You can assign from that; also note the $ operators on the variable names inside (()) are optional): There is also expr: In scripting $(()) is preferable since it avoids a fork/execute for the expr command.

Aug 12, 2015 · Aside of the "fi" at the end of your script (likely a copy-and-paste error?), the script looks correct, although it can be done easier: bash already has the capability to do calculation, so you don't need to create a child process by invoking …

Feb 7, 2021 · Solution to add two numbers in shell script: In this blog, we will calculate add two numbers in shell script or Linux or Unix. At first, take two numbers from the user and then store them two separate variables and then add them.

May 3, 2013 · Bash doesn't have floating-point types, but you can use a calculator such as bc: #!/bin/Bash. This doesn't work because the bash builtin math operator $(( )) only supports integers math operations. I have two numbers: value1=686 value2=228.35 I am not able to add an integer and a float. Please help me out to get the result.

Aug 8, 2012 · I'm trying to write a small script that adds two numbers as shown as in one of the tutorials we were given. echo "Enter two numbers" read num1 num2 sum = 'expr $num1 + $num2' echo "The sum is = $sum"

Nov 7, 2012 · The answer needs to specify in which shell the code is valid. For instance in the bourne Shell ( sh ) only the following instructions are valid: a=$((a+num)) a=$(($a+$num))

Feb 2, 2024 · This tutorial shows different ways of adding numbers in a bash script using expr, arithmetic expansion, bc and awk.

Discover how to bash add numbers effortlessly. This guide simplifies the process, showcasing essential commands for quick calculations in your scripts. In Bash, you can easily add numbers using arithmetic expansion with the `let` command or `$ ( ( ... ))` syntax. Here's a quick example: echo $result. What is Bash?