Perl of course, even if the adjective "proper" seems weird for Perl ;-) As a rule of thumb, if a script starts to need arrays or to handle spaces in filename,

Perl of course, even if the adjective "proper" seems weird for Perl ;-) As a rule of thumb, if a script starts to need arrays or to handle spaces in filename, I migrate it to Perl. Error handling is also easier and more natural in Perl.