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Re^6: du -h, sorted

by bellaire (Hermit)
on Feb 26, 2009 at 19:30 UTC ( #746640=note: print w/replies, xml ) Need Help??

in reply to Re^5: du -h, sorted
in thread du -h, sorted

Very impressive. Made me waste a lot of time trying to beat it!

I think I've got it just a little shorter. I don't know if the time I spent on this has brought me any closer to enlightenment, but it did make me fast (as in skip a meal)...
perl -e'%h=map{/.\s/;7**(ord$&&30)-$`,$_}`du -h`;die @h{sort %h}'
66 characters.

The key is the 7 to the power of ord(char) bitwise 30 part. I had to write a little perl script that would find the magic values 7 and 30 which would work for a lexicographic (default) sort. That is, I take 7 to the power of those values, and subtract the value of $` ... to produce hash keys which sort properly.

Then I take a hash slice on the sorted result. The sort actually returns the entire flattened hash sorted, keys and values, but since the values in that hash don't map to anything, they are silent.

I think I need to go get something to eat.

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Re^7: du -h, sorted
by hbm (Hermit) on Feb 26, 2009 at 19:49 UTC

    Beautiful!! And I hear you about the food thing. (Where are you? We could see how small a lunch we could get.)

    But I'm afraid you threw me a softball, easily shorted to 64:

    perl -e'%h=map{/.\s/;7**(ord$&&30)-$`,$_}`du -h`;die@h{sort%h}'
      I guess fasting doesn't necessarily improve golfing ability. :)

      Well played! I don't think I'll be able to get it any shorter than that.

      Oh, faux pas! Surely you are more honorable than that!

      And you didn't even know bears could type.

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