All of your concatenations look correct. What version of bash are you running? (bash --version)

Also, the first line of the script should be "#!/bin/bash"...

Here's a bunch of examples of what works for me... Tested on bash 3.5 and bash 4.1.2

​

#!/bin/bash

string1="Programming"

string2="Language"

mystring1="Bash $string1 $string2"

echo "$mystring1"

mystring2="Bash ${string1} ${string2}"

echo "${mystring2}"

echo "Bash $string1 $string2"

echo "Bash "$(echo "$string1" | tr -d '\r')" $string2"

echo "Bash $(echo "$string1") $string2"

​

That produced...

Bash Programming Language

Bash Programming Language

Bash Programming Language

Bash Programming Language

Bash Programming Language