Bash - concatenate two string variables

In this article, we would like to show you how to concatenate string variables in Bash.

Quick solution:

#!/bin/bash

variable_1='text_1'
variable_2='text_2'

result="${variable_1}${variable_2}"

Practical example

In this example, we create a and b variables inside a script.sh file and concatenate them into one - result with space between them. At the end we display the result using echo command.

script.sh file:

#!/bin/bash

a='Hello'
b='World!'

result="$a $b"

echo "$result"

Run in command line:

./script.sh

Output:

Hello World!

Note:

In this case, we don't need curly braces ({}). They are needed only when we want to limit variable name (explicitly indicate variable name).