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    And you should note that calling sort directly is better than anything else you could cobble up. GNU sort is designed to cope well with files that are much larger than RAM. Commented Mar 17, 2014 at 20:17
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    The --parallel sort option does not work on my RH6.5 servers. Sort --version thinks it comes out of coreutils 8.4. Which version do I need to the the parallel version ? Commented Apr 1, 2015 at 11:35
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    See also superuser.com/questions/938558/sort-parallel-isnt-parallelizing – you may have to specify something like -S512M if you notice it's not actually parallelising. Commented Nov 13, 2015 at 11:45