Many people have found questions asked once and again. The reasons for the OP to post a dupe might be varied (lazy at searching, unlucky at searching, feeling that the question being posted is actually different, etc.)

Some have put together a "Groups of duplicates" as an example, for instance, (1) Group duplicates, (2) Merge duplicates and (3) Text-shadow in IE.

What is the largest number of questions being duplicates of one another?

For instance, for item (2) above, it is N=10.

In what follows, I provide other examples that I found... they may be useful.

How to pass all arguments passed to my bash script to a function of mine?

Propagate all arguments in a bash shell script

How do I forward parameters to other command in bash script?


SEDE has an answer for you. I just ran it on Stack Overflow since I think that is the site with the highest count, but I didn't check.

This SEDE query gives you this results:

# dups  title
  6398  What is a NullPointerException, and how do I fix it?
  3186  How do I return the response from an asynchronous call?
  2990  What is a NullReferenceException, and how do I fix it?
  2402  How do I compare strings in Java?
  2354  PHP: "Notice: Undefined variable", "Notice: Undefined index", and "Notice: Undefined offset"
  1968  PHP Parse/Syntax Errors; and How to solve them?
  1850  mysqli_fetch_array()/mysqli_fetch_assoc()/mysqli_fetch_row() expects parameter 1 to be resource or mysqli_result, boolean given
  1822  What is an undefined reference/unresolved external symbol error and how do I fix it?
  1439  How to fix "Headers already sent" error in PHP
  1365  PHP mail form doesn't complete sending e-mail
  1261  Is floating point math broken?
  1147  Reference - What does this error mean in PHP?
  1075  Event binding on dynamically created elements?
  1074  JavaScript closure inside loops – simple practical example
  1071  How can I prevent SQL injection in PHP?
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  • This is fantastic! Now, it seems that looking for duplicates can be automated. Or is this just counting the duplicates that were flagged by hand (unlikely, given N=6398)? – sancho.s ReinstateMonicaCellio Jan 27 '17 at 12:17
  • No, these are the linked questions. The questions are all closed and just one link per question. – Patrick Hofman Jan 27 '17 at 12:18
  • I did not understand this comment... ( "linked question" == "flagged as duplicate" )? – sancho.s ReinstateMonicaCellio Jan 27 '17 at 13:54
  • I think I dupehammer using 2 & 3 about 4-5 times per day, and I was surprised not to see stackoverflow.com/questions/750486/… in your list – Jamiec Jan 27 '17 at 14:38
  • It is there right? @Jamiec Pre-last – Patrick Hofman Jan 27 '17 at 14:48
  • @PatrickHofman my bad. didnt see it down there – Jamiec Jan 27 '17 at 14:55
  • @PatrickHofman - If I understood correctly, even if the posted query provides very interesting info, it does not address the OP. I did not mean to find linked questions, but duplicates. – sancho.s ReinstateMonicaCellio Oct 14 '17 at 10:43

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