bash var in string code example

Example 1: combine strings bash

foo="Hello"
foo="${foo} World"
echo "${foo}"
> Hello World

Example 2: bash store string in variable

${!var}	#Just use to use reference value inside another variable ;)

Example 3: bash use variable in string

domain='http://www.whitehouse.gov'
path='/some/path'
base_url="$domain$path"