Bash - add text to string variable

In this article, we would like to show you how to add text to string variable in Bash.

Quick solution:

#!/bin/bash

variable_name='variable_value'
variable_name+=' additional_text'

result="${variable_1}"

Practical example

In this example, we create greeting variable inside a script.sh file and add text to it using += operator. At the end we display the variable using echo command.

script.sh file:

#!/bin/bash

greeting='Hello'
greeting+=' World!'

echo "$greeting"

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).

See also

1. Bash - concatenate two string variables