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I haven't currently run any tests on it, but the performance of the method you suggest varies based on a few factors:

- How your C library implements qsort. C doesn't specify which sorting...

It's probably easier just to use a simple binary tree since they're very easy to implement and they're ideal for this particular task. With an array you need to make define a maximum limit (unless...

Nah. My first suggestion involves writing a C program and my second one involves using a program that does a similar thing in a more generic way. You don't need to write a bash script for either, but...

Store each record into a struct and insert it in an ordered binary tree, then write each record in order.

edit: Or just use "sort -n".