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How can I exclude all “permission denied” messages from “find”?

... Note: * This answer probably goes deeper than the use case warrants, and find 2>/dev/null may be good enough in many situations. It may still be of interest for a cross-platform perspective and for its discussion of some advanced shell techniques in the interest of finding a solution that i...
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pandas: How do I split text in a column into multiple rows?

I'm working with a large csv file and the next to last column has a string of text that I want to split by a specific delimiter. I was wondering if there is a simple way to do this using pandas or python? ...
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Quick-and-dirty way to ensure only one instance of a shell script is running at a time

What's a quick-and-dirty way to make sure that only one instance of a shell script is running at a given time? 40 Answers ...
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Why is [1,2] + [3,4] = “1,23,4” in JavaScript?

...d for arrays. What happens is that Javascript converts arrays into strings and concatenates those.   Update Since this question and consequently my answer is getting a lot of attention I felt it would be useful and relevant to have an overview about how the + operator behaves in general also. So, h...
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Counting inversions in an array

... find all inversion pairs such that A[i] > A[j] . I'm using merge sort and copying array A to array B and then comparing the two arrays, but I'm having a difficult time seeing how I can use this to find the number of inversions. Any hints or help would be greatly appreciated. ...
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java.lang.UnsupportedClassVersionError: Bad version number in .class file?

... suggestions on the web indicate that the code was compiled in one version and executed in another version (new on old). However, I only have one version of JRE on my system. If I run the commands: ...
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Difference between `set`, `setq`, and `setf` in Common Lisp?

What is the difference between "set", "setq", and "setf" in Common Lisp? 6 Answers 6 ...
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Get the week start date and week end date from week number

... You can find the day of week and do a date add on days to get the start and end dates.. DATEADD(dd, -(DATEPART(dw, WeddingDate)-1), WeddingDate) [WeekStart] DATEADD(dd, 7-(DATEPART(dw, WeddingDate)), WeddingDate) [WeekEnd] You probably also want to l...
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Simple Digit Recognition OCR in OpenCV-Python

...v2). It is just for learning purposes. I would like to learn both KNearest and SVM features in OpenCV. 3 Answers ...
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Automatic Preferred Max Layout Width is not available on iOS versions prior to 8.0

I opened an existing iOS project with Xcode6 beta6, and Xcode lists the following warning for both Storyboard and Xib files: ...