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Sort::Merge -- When you need to merge sort. Anything. And do anything with it. Merge sorting is a technique for merging together multiple input streams, each of which is sorted, into one larger output stream, still sorted. This module implements that algorithm. Note the large caveat above: the inputs must already be sorted. If the inputs aren't sorted, you'll need to sort them yourself first, in which case a merge sort may not be the right algorithm for the job. Sort::Merge was designed to give you, the programmer, control over where your data comes from, and where it goes -- it's simply supposed to sort it, and not fetch it from files, parse out sort keys, etc, etc. There's at least one merge-sorting module already on CPAN, File::MergeSort, but I wanted one that I could use to sort together multiple files that were of different formats, and not line-oriented formats either. The module I got out doesn't even require that the inputs are files at all, or that the output gets printed. It also streams the output, so you needn't wait until the sort is complete before printing the first piece of output. (The fact that this is possible at all is one of more useful properties of merge sorts vs. other sorts.) Most (OK, at the moment all) of the available interfaces require you to write your input and output handlers in terms of coderefs. If this is too much work for you, I encourage you to not use this module, or, alternatively, to propose another interface to me. I'm actively looking for more and better interfaces.