The road to wisdom? Well its plain and simple to express: Err and err and err again, but less and less and less.
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You're replying to a comment by John.
Nice article. I enjoy your work.
I noticed a problem with one of your published methods for set intersection
sort A B | uniq -d
will report items that are duplicated in either set A or set B as intersections. So one has to make sure A and B are uniq'd first which seems to make the command a bit more complicated and it will run a lot slower.
sort <(sort A | uniq) <(sort B | uniq) | uniq -d
Perhaps you might see a way to do this more efficiently.
Also, the join and comm methods may not work reliably on large data sets. I get no intersection on my Abig and Bbig sets. The nifty grep method seems to work the best.
(why do I need your e-mail?)
It would be nice if you left your e-mail address. Sometimes I want to send a private message, or just thank for the great comment. Having your e-mail really helps.
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(Your twitter handle, if you have one.)
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