use G;

Without additional options it'll glob the usual way, if you do it like this

perl -MG=R -pi.bak -e"s#\bGPP\b#Arjun#i;" *.dsp
[download]

it'll glob recursively.

P.S.: You can install the module by PPM from http://jenda.krynicky.cz/perl

Jenda
Always code as if the guy who ends up maintaining your code will be a violent psychopath who knows where you live.
   -- Rick Osborne

Edit by castaway: Closed small tag in signature