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MongoDB: How to update multiple documents with a single command?

I was surprised to find that the following example code only updates a single document: 12 Answers ...
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Returning value from called function in a shell script

I want to return the value from a function called in a shell script. Perhaps I am missing the syntax. I tried using the global variables. But that is also not working. The code is: ...
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Python != operation vs “is not”

In a comment on this question , I saw a statement that recommended using 5 Answers 5 ...
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Convert a CERT/PEM certificate to a PFX certificate

I've seen a couple questions about how to convert a PFX to a cert file, but I need to go the other way. 4 Answers ...
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How do you read from stdin?

I'm trying to do some of the code golf challenges, but they all require the input to be taken from stdin . How do I get that in Python? ...
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Enter triggers button click

I have a page with two buttons. One is a <button> element and the other is a <input type="submit"> . The buttons appear on the page in that order. If I'm in a text field anywhere in the form and press <Enter> , the button element's click event is triggered. I assume that's be...
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How to attach file to a github issue?

I migrated with a project from Bitbucket to Github and I can not find a way to attach a file to an issue (ex: screenshot, specs, etc) ...
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Rolling median algorithm in C

I am currently working on an algorithm to implement a rolling median filter (analogous to a rolling mean filter) in C. From my search of the literature, there appear to be two reasonably efficient ways to do it. The first is to sort the initial window of values, then perform a binary search to inser...
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Why is isNaN(null) == false in JS?

This code in JS gives me a popup saying "i think null is a number", which I find slightly disturbing. What am I missing? 8 ...
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Tricky Google interview question

A friend of mine is interviewing for a job. One of the interview questions got me thinking, just wanted some feedback. 21 A...