concatenate strings in shell script code example

Example 1: combine strings bash

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

Example 2: concatenate strings bash

VAR1="Hello,"
VAR2=" World"
VAR3="$VAR1$VAR2"
echo "$VAR3"

Example 3: bash concatenate string variables

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