cat add-data.txt

432 10TH ST APT (Range 2A - 2B)
BROOKLYN NY 10598-6601
432 10TH ST APT (Range 3A - 3B)
BROOKLYN NY 10598-6601
432 10TH ST APT (Range 4A - 4B)
BROOKLYN NY 10598-6605
432 10TH ST APT (Range 5A - 5D)
BROOKLYN NY 10598-6605
432 10TH ST APT 6A
BROOKLYN NY 10598-6605

perl -i.bak -p -e "s/BROOKLYN/BROCCOLINO/ and $c++; END{print qq($c changes\n)}" add-data.txt
5 changes

cat add-data.txt

432 10TH ST APT (Range 2A - 2B)
BROCCOLINO NY 10598-6601
432 10TH ST APT (Range 3A - 3B)
BROCCOLINO NY 10598-6601
432 10TH ST APT (Range 4A - 4B)
BROCCOLINO NY 10598-6605
432 10TH ST APT (Range 5A - 5D)
BROCCOLINO NY 10598-6605
432 10TH ST APT 6A
BROCCOLINO NY 10598-6605