shell - How to concatenate string variables in Bash

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In PHP, strings are concatenated
together as follows:

$foo =
            "Hello";
$foo .= "
            World";

Here,
$foo becomes "Hello
World".

How is this accomplished in
Bash?

Answer

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

In
general to concatenate two variables you can just write them one after
another:

a='Hello'
b='World'
c="${a}
            ${b}"
echo "${c}"
> Hello
            World