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Unless you are doing hardcore systems programming, there is almost never a reason to write your own sort.

Where's the C library function for "sort the N-byte records in the file named 'foo' which is too large to fit into RAM"?

Perhaps not in libc but on my freebsd box /usr/src/gnu/usr.bin/sort/sort.c delivers the goods if foo has newlines.

system('sort filename');

"almost never a reason to write your own sort"

What about being drunk on New Year's Eve?

That's... uh; that's hardly a reason for anything. Except hooking up with that hot little secretary you had a crush on forever.