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How do I merge changes to a single file, rather than merging commits?

I have two branches (A and B) and I want to merge a single file from branch A with a corresponding single file from Branch B. ...
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How to mkdir only if a directory does not already exist?

... run under the KornShell (ksh) on AIX. I would like to use the mkdir command to create a directory. But the directory may already exist, in which case I do not want to do anything. So I want to either test to see that the directory does not exist, or suppress the "File exists" error that mkdir t...
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Is there a way of having git show lines added, lines changed and lines removed?

"git diff --stat" and "git log --stat" show output like: 5 Answers 5 ...
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Not able to type in textfield in iphone simulator using Mac Keyboard?

I'm working on a basic iOS app which supports both portrait and landscape modes. When the iPhone simulator keyboard is open in landscape and I'm switching the app to portrait mode I'm unable to type anything in any text field using my Mac physical keyboard. ...
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Unable to load DLL 'SQLite.Interop.dll'

...figured in NuGet with only the Sqlite core package.). The project compiles and copies all the Sqlite dll-s except the 'SQLite.Interop.dll' (both x86 and x64 folder). The solution was very simple: just add the Sqlite.Core package as a dependency (with NuGet) to the project you are building/running a...
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Representing null in JSON

... Let's evaluate the parsing of each: http://jsfiddle.net/brandonscript/Y2dGv/ var json1 = '{}'; var json2 = '{"myCount": null}'; var json3 = '{"myCount": 0}'; var json4 = '{"myString": ""}'; var json5 = '{"myString": "null"}'; var json6 = '{"myArray": []}'; console.log(JSON.parse(js...
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What is the purpose and use of **kwargs?

...x when calling functions by constructing a dictionary of keyword arguments and passing it to your function: >>> kwargs = {'first_name': 'Bobby', 'last_name': 'Smith'} >>> print_keyword_args(**kwargs) first_name = Bobby last_name = Smith The Python Tutorial contains a good explan...
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How to kill a child process after a given timeout in Bash?

... launches a child process that crashes (actually, hangs) from time to time and with no apparent reason (closed source, so there isn't much I can do about it). As a result, I would like to be able to launch this process for a given amount of time, and kill it if it did not return successfully after a...
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Reshape three column data frame to matrix (“long” to “wide” format) [duplicate]

...y ways to do this. This answer starts with what is quickly becoming the standard method, but also includes older methods and various other methods from answers to similar questions scattered around this site. tmp <- data.frame(x=gl(2,3, labels=letters[24:25]), y=gl(3,1,6, labe...
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Shell one liner to prepend to a file

... The hack below was a quick off-the-cuff answer which worked and received lots of upvotes. Then, as the question became more popular and more time passed, outraged people started reporting that it sorta worked but weird things could happen, or it just didn't work at all, so it was furi...