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This has been posted in the past many times.

• tedunangst 12y ago
  Which is curious. Some content you run into by accident and think needs reposting. But how does one stumble upon this post in 2015? Googling for "why is gnu grep fast" and then not noticing that two of the top four results are submissions to HN?
  • danudey 12y ago
    Finding it linked from some other article or blog post, or having it sent to you from someone else and then assuming that a mail thread from 2010 has never been seen on HN before.
  • werid 12y ago
    the source this time is probably twitter: https://twitter.com/b0rk/status/573535058797031424 https://twitter.com/b0rk/status/573535058797031424