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PHP shell_exec() vs exec()

I'm struggling to understand the difference between shell_exec() and exec() ... 4 Answers ...
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Volley Android Networking Library

I have few questions around using Volley in my projects: 19 Answers 19 ...
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Hour from DateTime? in 24 hours format

So i have this DateTime? and what i want to do is to obtain the hour but show it in 24 hours format. For example: If the hour is 2:20:23 p.m. i want to convert it to 14:20 and that's it. ...
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Regex to match any character including new lines

Is there a regex to match "all characters including newlines"? 4 Answers 4 ...
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How do I install Eclipse Marketplace in Eclipse Classic?

I'm running Eclipse 3.6.1 Classic, which does not come with the Eclipse Marketplace plugin by default. I've looked around the Eclipse website, but I don't see an available plugin for installing Eclipse Marketplace. Am I just not seeing it? ...
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Pros and cons to use Celery vs. RQ [closed]

Currently I'm working on python project that requires implement some background jobs (mostly for email sending and heavily database updates). I use Redis for task broker. So in this point I have two candidates: Celery and RQ . I had some experience with these job queues, but I want to ask you guy...
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Remove IE10's “clear field” X button on certain inputs?

It's a useful feature, to be sure, but is there any way to disable it? For instance, if the form is a single text field and already has a "clear" button beside it, it's superfluous to also have the X. In this situation, it would be better to remove it. ...
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Enum type constraints in C# [duplicate]

What is the reason behind C# not allowing type constraints on Enum 's? I'm sure there is a method behind the madness, but I'd like to understand why it's not possible. ...
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What does the -ObjC linker flag do?

I have an app that works with and without the linker flag. However, without the linker flag, I get a very different behaviour when adding data to a view. ...
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How to obtain the number of CPUs/cores in Linux from the command line?

I have this script, but I do not know how to get the last element in the printout: 27 Answers ...