Write a program that first parses the IP addresses, then sorts them.
Depending on how many IP addresses are to be sorted, you might want to
use a heapsort or a quicksort, or you might be fine with even the most
primitive form of bubblesort.
Or you could write a program that generates a key, say, a 12-digit zoned
decimal number, by parsing each IP address, and puts the addresses into
a new file keyed on that 12-digit zoned decimal number.
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