I use Perl; not sure if such interpreter/scripts are 'real' languages, but there isn't that much difference. They all use same logic/algorithms?
Perl is nice because it has huge library and you don't have to worry much about data type (that can be problem sometimes, though).
It seems lately its not so popular, not as Python. Perl isn't so readable.
I mainly use it for parsing text and similar tasks. Some say its faster for Python for such applications.