program that takes a list of C/C++/header files and looks through all of them for a regexp but recursively, which can be neat. say you're looking for a certain function in a program, but it's not in that program, and it's not in any of the headers that program uses, it would have to be in one of the headers of one of the headers, or could even go further or further. greph.pl will look all through these and keep on looking recursively without repeating files
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