It's also about not having to dump it into a long directory path to copy/move
it out of to a final destination. Output'ing to stdout makes it simple to 
dump in the immediate directory.

James

>
>> you only need a temporary directory if you need to avoid accidentally
>> clobbering any other file by the same name.
>
>...huh?  You appear to be assuming that the idea of extracting a file,
>even to stdout, is to put the file's contents on disk.
>Extract-to-stdout is not just about file names; it's also about not
>having to store the whole file at once.
>
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