Demonstrating how to call a function in Bash that updates a global without the global actually getting updated. =P

settingGlobalsTest.bash

#!/bin/bash

testGlobal=0;

updateGlobal(){
  testGlobal=50;
  echo "World!";
}

#Output the return value directly
echo "Hello $(updateGlobal)"; # Output: Hello World!
echo $testGlobal; # Global is 0

#Output the return value indirectly
echo -n "Hello "; updateGlobal; #Output: Hello World
echo $testGlobal; # Global is 50