Might be a bit easier to do:

ack -f --perl | cscope -b -q -i -
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Having done that, my editor doesn't take cscope output - but it does tack ctags output, so same idea:

ack -f --perl | ctags -L -
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If you don't have ack, you should. It's written in perl, and is way easier to use than grep, with way more functionality.