Using Ack to Replace Text in Large File
https://stackoverflow.com/questions/4792561/how-to-do-search-replace-with-ack-in-vim
ack -l 'pattern' | xargs perl -pi -E 's/pattern/replacement/g'
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https://stackoverflow.com/questions/4792561/how-to-do-search-replace-with-ack-in-vim
ack -l 'pattern' | xargs perl -pi -E 's/pattern/replacement/g'