Modifiable NMERGE in sort

[Bo Borgerson]

Hi,

I've found at times that it's useful to merge more than NMERGE
(currently 16) inputs without using temp files.

I've modified my local version of sort to allow this number to be
overridden on the command-line (please see enclosed patch).

Is this an option that might be worth including in a future release?

Thanks,

Bo

sort.c.diff
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