Adding a newline character in concat method

I am trying to create a txt file in UNIX environment and building a string using concat method.  The requirement is to insert a new line between the string value.  I tried the following but nothing seems to work.

1. concat("FirstLine","\n","SecondLine);
2. concat("FirstLine","\\n","SecondLine);
3. concat("FirstLine","/\n","SecondLine);
4. concat("FirstLine","&#xA","SecondLine);
5. concat("FirstLine","&#x0A","SecondLine);
6. concat("FirstLine","&#xD","SecondLine);
7. concat("FirstLine","&#x0D","SecondLine);
8. concat("FirstLine",CHAR(10),"SecondLine);
9. concat("FirstLine",Char(10),"SecondLine);

attempts 1-7 concatenated the string into only one line.  Attempts 8,9 threw an error saying "CHAR" or "Char" is not a valid method.  Can anyone help me out with this?

Thanks a lot