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  • @Stéphane Chazelas Thank you very much for that edit. I was writing dirty, ignoring "proper" quoting as it's not needed in this case, but I am very grateful for the shortcuts! Commented May 18, 2015 at 13:51
  • I tried your bash solution. It's very nice; I like it a lot. It worked well for about 24 hours or so before I noticed my system was completely locked up. Tried something similar with `python; with a similar result, although it was considerably quicker. Commented Oct 4, 2016 at 20:57
  • How to do the C solution with multi-threading? Commented Jul 27, 2022 at 13:50
  • 1
    @dtrunk That's an interesting modification to the problem. You can use local buffers with a reentrant permute function, partition on the first written letter and do the rest with the permute function. You'll also want to use thread-local io buffers. I even get a slowdown in the multithreaded solution if I simply use puts, but with thread-local io buffers, the multithreaded approach is faster. pastebin.com/Pz5ivKE9 Commented Jul 27, 2022 at 16:17